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

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Solution for (7x-9)(9x+1)=0 equation:


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

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

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

Multiply (-9 + 7x) * (1 + 9x)
(-9(1 + 9x) + 7x * (1 + 9x)) = 0
((1 * -9 + 9x * -9) + 7x * (1 + 9x)) = 0
((-9 + -81x) + 7x * (1 + 9x)) = 0
(-9 + -81x + (1 * 7x + 9x * 7x)) = 0
(-9 + -81x + (7x + 63x2)) = 0

Combine like terms: -81x + 7x = -74x
(-9 + -74x + 63x2) = 0

Solving
-9 + -74x + 63x2 = 0

Solving for variable 'x'.

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

Subproblem 1

Set the factor '(-1 + -9x)' equal to zero and attempt to solve: Simplifying -1 + -9x = 0 Solving -1 + -9x = 0 Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -9x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -9x = 0 + 1 -9x = 0 + 1 Combine like terms: 0 + 1 = 1 -9x = 1 Divide each side by '-9'. x = -0.1111111111 Simplifying x = -0.1111111111

Subproblem 2

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

Solution

x = {-0.1111111111, 1.285714286}

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