To find the roots of the expression,set the expression equal to 0
x3−x2−x×9=0
Use the commutative property to reorder the terms
x3−x2−9x=0
Factor the expression
x(x2−x−9)=0
Separate the equation into 2 possible cases
x=0x2−x−9=0
Solve the equation
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Evaluate
x2−x−9=0
Substitute a=1,b=−1 and c=−9 into the quadratic formula x=2a−b±b2−4ac
x=21±(−1)2−4(−9)
Simplify the expression
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Evaluate
(−1)2−4(−9)
Evaluate the power
1−4(−9)
Multiply the numbers
1−(−36)
If a negative sign or a subtraction symbol appears outside parentheses, remove the parentheses and change the sign of every term within the parentheses