0=(7x+4)(x-9)

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Solution for 0=(7x+4)(x-9) equation:


Simplifying
0 = (7x + 4)(x + -9)

Reorder the terms:
0 = (4 + 7x)(x + -9)

Reorder the terms:
0 = (4 + 7x)(-9 + x)

Multiply (4 + 7x) * (-9 + x)
0 = (4(-9 + x) + 7x * (-9 + x))
0 = ((-9 * 4 + x * 4) + 7x * (-9 + x))
0 = ((-36 + 4x) + 7x * (-9 + x))
0 = (-36 + 4x + (-9 * 7x + x * 7x))
0 = (-36 + 4x + (-63x + 7x2))

Combine like terms: 4x + -63x = -59x
0 = (-36 + -59x + 7x2)

Solving
0 = -36 + -59x + 7x2

Solving for variable 'x'.

Combine like terms: 0 + 36 = 36
36 + 59x + -7x2 = -36 + -59x + 7x2 + 36 + 59x + -7x2

Reorder the terms:
36 + 59x + -7x2 = -36 + 36 + -59x + 59x + 7x2 + -7x2

Combine like terms: -36 + 36 = 0
36 + 59x + -7x2 = 0 + -59x + 59x + 7x2 + -7x2
36 + 59x + -7x2 = -59x + 59x + 7x2 + -7x2

Combine like terms: -59x + 59x = 0
36 + 59x + -7x2 = 0 + 7x2 + -7x2
36 + 59x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
36 + 59x + -7x2 = 0

Factor a trinomial.
(9 + -1x)(4 + 7x) = 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 '(4 + 7x)' equal to zero and attempt to solve: Simplifying 4 + 7x = 0 Solving 4 + 7x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 7x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 7x = 0 + -4 7x = 0 + -4 Combine like terms: 0 + -4 = -4 7x = -4 Divide each side by '7'. x = -0.5714285714 Simplifying x = -0.5714285714

Solution

x = {9, -0.5714285714}

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