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

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


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

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

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

Multiply (9 + 4x) * (-4 + x)
(9(-4 + x) + 4x * (-4 + x)) = 0
((-4 * 9 + x * 9) + 4x * (-4 + x)) = 0
((-36 + 9x) + 4x * (-4 + x)) = 0
(-36 + 9x + (-4 * 4x + x * 4x)) = 0
(-36 + 9x + (-16x + 4x2)) = 0

Combine like terms: 9x + -16x = -7x
(-36 + -7x + 4x2) = 0

Solving
-36 + -7x + 4x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -4x)(4 + -1x) = 0

Subproblem 1

Set the factor '(-9 + -4x)' equal to zero and attempt to solve: Simplifying -9 + -4x = 0 Solving -9 + -4x = 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 + -4x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -4x = 0 + 9 -4x = 0 + 9 Combine like terms: 0 + 9 = 9 -4x = 9 Divide each side by '-4'. x = -2.25 Simplifying x = -2.25

Subproblem 2

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 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 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Solution

x = {-2.25, 4}

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