(x-4)(x+9)=

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


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

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

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

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

Combine like terms: -4x + 9x = 5x
(-36 + 5x + x2) = 0

Solving
-36 + 5x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -1x)(4 + -1x) = 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 + -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 = {-9, 4}

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