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

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


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

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

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

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

Combine like terms: 9x + -56x = -47x
0 = (-72 + -47x + 7x2)

Solving
0 = -72 + -47x + 7x2

Solving for variable 'x'.

Combine like terms: 0 + 72 = 72
72 + 47x + -7x2 = -72 + -47x + 7x2 + 72 + 47x + -7x2

Reorder the terms:
72 + 47x + -7x2 = -72 + 72 + -47x + 47x + 7x2 + -7x2

Combine like terms: -72 + 72 = 0
72 + 47x + -7x2 = 0 + -47x + 47x + 7x2 + -7x2
72 + 47x + -7x2 = -47x + 47x + 7x2 + -7x2

Combine like terms: -47x + 47x = 0
72 + 47x + -7x2 = 0 + 7x2 + -7x2
72 + 47x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
72 + 47x + -7x2 = 0

Factor a trinomial.
(8 + -1x)(9 + 7x) = 0

Subproblem 1

Set the factor '(8 + -1x)' equal to zero and attempt to solve: Simplifying 8 + -1x = 0 Solving 8 + -1x = 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 + -1x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1x = 0 + -8 -1x = 0 + -8 Combine like terms: 0 + -8 = -8 -1x = -8 Divide each side by '-1'. x = 8 Simplifying x = 8

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 = {8, -1.285714286}

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