Question
Simplify the expression
−21x8+2x7−25x6+x5
Evaluate
−21x2(x×1)3(x−1)2(x−2)
Any expression multiplied by 1 remains the same
−21x2×x3(x−1)2(x−2)
Multiply the terms
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Multiply the terms
21x2×x3(x−1)2(x−2)
Multiply the terms with the same base by adding their exponents
21x2+3(x−1)2(x−2)
Add the numbers
21x5(x−1)2(x−2)
Multiply the terms
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Evaluate
21(x−2)
Apply the distributive property
21x−21×2
Multiply the numbers
21x−1
(21x−1)x5(x−1)2
−(21x−1)x5(x−1)2
Calculate
(−21x+1)x5(x−1)2
Expand the expression
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Evaluate
(x−1)2
Use (a−b)2=a2−2ab+b2 to expand the expression
x2−2x×1+12
Calculate
x2−2x+1
(−21x+1)x5(x2−2x+1)
Multiply the terms
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Evaluate
(−21x+1)x5
Apply the distributive property
−21x×x5+1×x5
Multiply the terms
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Evaluate
x×x5
Use the product rule an×am=an+m to simplify the expression
x1+5
Add the numbers
x6
−21x6+1×x5
Any expression multiplied by 1 remains the same
−21x6+x5
(−21x6+x5)(x2−2x+1)
Apply the distributive property
−21x6×x2−(−21x6×2x)−21x6×1+x5×x2−x5×2x+x5×1
Multiply the terms
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Evaluate
x6×x2
Use the product rule an×am=an+m to simplify the expression
x6+2
Add the numbers
x8
−21x8−(−21x6×2x)−21x6×1+x5×x2−x5×2x+x5×1
Multiply the terms
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Evaluate
−21x6×2x
Multiply the numbers
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Evaluate
−21×2
Reduce the numbers
−1×1
Simplify
−1
−x6×x
Multiply the terms
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Evaluate
x6×x
Use the product rule an×am=an+m to simplify the expression
x6+1
Add the numbers
x7
−x7
−21x8−(−x7)−21x6×1+x5×x2−x5×2x+x5×1
Any expression multiplied by 1 remains the same
−21x8−(−x7)−21x6+x5×x2−x5×2x+x5×1
Multiply the terms
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Evaluate
x5×x2
Use the product rule an×am=an+m to simplify the expression
x5+2
Add the numbers
x7
−21x8−(−x7)−21x6+x7−x5×2x+x5×1
Multiply the terms
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Evaluate
x5×2x
Use the commutative property to reorder the terms
2x5×x
Multiply the terms
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Evaluate
x5×x
Use the product rule an×am=an+m to simplify the expression
x5+1
Add the numbers
x6
2x6
−21x8−(−x7)−21x6+x7−2x6+x5×1
Any expression multiplied by 1 remains the same
−21x8−(−x7)−21x6+x7−2x6+x5
If a negative sign or a subtraction symbol appears outside parentheses, remove the parentheses and change the sign of every term within the parentheses
−21x8+x7−21x6+x7−2x6+x5
Add the terms
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Evaluate
x7+x7
Collect like terms by calculating the sum or difference of their coefficients
(1+1)x7
Add the numbers
2x7
−21x8+2x7−21x6−2x6+x5
Solution
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Evaluate
−21x6−2x6
Collect like terms by calculating the sum or difference of their coefficients
(−21−2)x6
Subtract the numbers
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Evaluate
−21−2
Reduce fractions to a common denominator
−21−22×2
Write all numerators above the common denominator
2−1−2×2
Multiply the numbers
2−1−4
Subtract the numbers
2−5
Use b−a=−ba=−ba to rewrite the fraction
−25
−25x6
−21x8+2x7−25x6+x5
Show Solution

Find the roots
x1=0,x2=1,x3=2
Evaluate
−21(x2)(x×1)3(x−1)2(x−2)
To find the roots of the expression,set the expression equal to 0
−21(x2)(x×1)3(x−1)2(x−2)=0
Any expression multiplied by 1 remains the same
−21(x2)x3(x−1)2(x−2)=0
Calculate
−21x2×x3(x−1)2(x−2)=0
Multiply the terms
More Steps

Multiply the terms
21x2×x3(x−1)2(x−2)
Multiply the terms with the same base by adding their exponents
21x2+3(x−1)2(x−2)
Add the numbers
21x5(x−1)2(x−2)
Multiply the terms
More Steps

Evaluate
21(x−2)
Apply the distributive property
21x−21×2
Multiply the numbers
21x−1
(21x−1)x5(x−1)2
−(21x−1)x5(x−1)2=0
Calculate
(−21x+1)x5(x−1)2=0
Change the sign
(21x−1)x5(x−1)2=0
Separate the equation into 3 possible cases
21x−1=0x5=0(x−1)2=0
Solve the equation
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Evaluate
21x−1=0
Move the constant to the right-hand side and change its sign
21x=0+1
Removing 0 doesn't change the value,so remove it from the expression
21x=1
Multiply by the reciprocal
21x×2=1×2
Multiply
x=1×2
Any expression multiplied by 1 remains the same
x=2
x=2x5=0(x−1)2=0
The only way a power can be 0 is when the base equals 0
x=2x=0(x−1)2=0
Solve the equation
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Evaluate
(x−1)2=0
The only way a power can be 0 is when the base equals 0
x−1=0
Move the constant to the right-hand side and change its sign
x=0+1
Removing 0 doesn't change the value,so remove it from the expression
x=1
x=2x=0x=1
Solution
x1=0,x2=1,x3=2
Show Solution
