Algebra
Calculus
Trigonometry
Matrix
Question
Simplify the expression
9x2−81x
Evaluate
(x−9)(x×9)
Remove the parentheses
(x−9)x×9
Use the commutative property to reorder the terms
(x−9)×9x
Multiply the terms
9x(x−9)
Apply the distributive property
9x×x−9x×9
Multiply the terms
9x2−9x×9
Solution
9x2−81x
Show Solution
Find the roots
x1=0,x2=9
Evaluate
(x−9)(x×9)
To find the roots of the expression,set the expression equal to 0
(x−9)(x×9)=0
Use the commutative property to reorder the terms
(x−9)×9x=0
Multiply the terms
9x(x−9)=0
Elimination the left coefficient
x(x−9)=0
Separate the equation into 2 possible cases
x=0x−9=0
Solve the equation
More Steps
Evaluate
x−9=0
Move the constant to the right-hand side and change its sign
x=0+9
Removing 0 doesn't change the value,so remove it from the expression
x=9
x=0x=9
Solution
x1=0,x2=9
Show Solution