(7x-8)(7x+9)=0

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Solution for (7x-8)(7x+9)=0 equation: 


Simplifying
(7x + -8)(7x + 9) = 0

Reorder the terms:
(-8 + 7x)(7x + 9) = 0

Reorder the terms:
(-8 + 7x)(9 + 7x) = 0

Multiply (-8 + 7x) * (9 + 7x)
(-8(9 + 7x) + 7x * (9 + 7x)) = 0
((9 * -8 + 7x * -8) + 7x * (9 + 7x)) = 0
((-72 + -56x) + 7x * (9 + 7x)) = 0
(-72 + -56x + (9 * 7x + 7x * 7x)) = 0
(-72 + -56x + (63x + 49x2)) = 0

Combine like terms: -56x + 63x = 7x
(-72 + 7x + 49x2) = 0

Solving
-72 + 7x + 49x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -7x)(8 + -7x) = 0


Subproblem 1
Set the factor '(-9 + -7x)' equal to zero and attempt to solve:

Simplifying
-9 + -7x = 0

Solving
-9 + -7x = 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 + -7x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -7x = 0 + 9
-7x = 0 + 9

Combine like terms: 0 + 9 = 9
-7x = 9

Divide each side by '-7'.
x = -1.285714286

Simplifying
x = -1.285714286

Subproblem 2
Set the factor '(8 + -7x)' equal to zero and attempt to solve:

Simplifying
8 + -7x = 0

Solving
8 + -7x = 0

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

Add '-8' to each side of the equation.
8 + -8 + -7x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -7x = 0 + -8
-7x = 0 + -8

Combine like terms: 0 + -8 = -8
-7x = -8

Divide each side by '-7'.
x = 1.142857143

Simplifying
x = 1.142857143
Solution
x = {-1.285714286, 1.142857143}

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