Câu hỏi
Find the roots
x1=29−317,x2=29+317
Alternative Form
x1≈−1.684658,x2≈10.684658
Evaluate
x2−9x−18
To find the roots of the expression,set the expression equal to 0
x2−9x−18=0
Substitute a=1,b=−9 and c=−18 into the quadratic formula x=2a−b±b2−4ac
x=29±(−9)2−4(−18)
Simplify the expression
Thêm Bước
Evaluate
(−9)2−4(−18)
Multiply the numbers
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Evaluate
4(−18)
Multiplying or dividing an odd number of negative terms equals a negative
−4×18
Multiply the numbers
−72
(−9)2−(−72)
Rewrite the expression
92−(−72)
If a negative sign or a subtraction symbol appears outside parentheses, remove the parentheses and change the sign of every term within the parentheses
92+72
Evaluate the power
81+72
Add the numbers
153
x=29±153
Simplify the radical expression
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Evaluate
153
Write the expression as a product where the root of one of the factors can be evaluated
9×17
Write the number in exponential form with the base of 3
32×17
The root of a product is equal to the product of the roots of each factor
32×17
Reduce the index of the radical and exponent with 2
317
x=29±317
Separate the equation into 2 possible cases
x=29+317x=29−317
Giải pháp
x1=29−317,x2=29+317
Alternative Form
x1≈−1.684658,x2≈10.684658
Hiển thị giải pháp