-(x-9)(2x+7)=0

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Solution for -(x-9)(2x+7)=0 equation: 


Simplifying
-1(x + -9)(2x + 7) = 0

Reorder the terms:
-1(-9 + x)(2x + 7) = 0

Reorder the terms:
-1(-9 + x)(7 + 2x) = 0

Multiply (-9 + x) * (7 + 2x)
-1(-9(7 + 2x) + x(7 + 2x)) = 0
-1((7 * -9 + 2x * -9) + x(7 + 2x)) = 0
-1((-63 + -18x) + x(7 + 2x)) = 0
-1(-63 + -18x + (7 * x + 2x * x)) = 0
-1(-63 + -18x + (7x + 2x2)) = 0

Combine like terms: -18x + 7x = -11x
-1(-63 + -11x + 2x2) = 0
(-63 * -1 + -11x * -1 + 2x2 * -1) = 0
(63 + 11x + -2x2) = 0

Solving
63 + 11x + -2x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(9 + -1x)(7 + 2x) = 0


Subproblem 1
Set the factor '(9 + -1x)' equal to zero and attempt to solve:

Simplifying
9 + -1x = 0

Solving
9 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + -1x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1x = 0 + -9
-1x = 0 + -9

Combine like terms: 0 + -9 = -9
-1x = -9

Divide each side by '-1'.
x = 9

Simplifying
x = 9

Subproblem 2
Set the factor '(7 + 2x)' equal to zero and attempt to solve:

Simplifying
7 + 2x = 0

Solving
7 + 2x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-7' to each side of the equation.
7 + -7 + 2x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 2x = 0 + -7
2x = 0 + -7

Combine like terms: 0 + -7 = -7
2x = -7

Divide each side by '2'.
x = -3.5

Simplifying
x = -3.5
Solution
x = {9, -3.5}

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