Question
Simplify the expression
21x−1
Evaluate
42(x−2)
Cancel out the common factor 2
21(x−2)
Apply the distributive property
21x−21×2
Solution
More Steps

Evaluate
21×2
Reduce the numbers
1×1
Simplify
1
21x−1
Show Solution

Find the roots
x=2
Evaluate
42(x−2)
To find the roots of the expression,set the expression equal to 0
42(x−2)=0
Cancel out the common factor 2
21(x−2)=0
Multiply the terms
More Steps

Evaluate
21(x−2)
Apply the distributive property
21x−21×2
Multiply the numbers
More Steps

Evaluate
21×2
Reduce the numbers
1×1
Simplify
1
21x−1
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
Solution
x=2
Show Solution
