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

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


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

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

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

Multiply (7 + x) * (-4 + x)
(7(-4 + x) + x(-4 + x)) = 0
((-4 * 7 + x * 7) + x(-4 + x)) = 0
((-28 + 7x) + x(-4 + x)) = 0
(-28 + 7x + (-4 * x + x * x)) = 0
(-28 + 7x + (-4x + x2)) = 0

Combine like terms: 7x + -4x = 3x
(-28 + 3x + x2) = 0

Solving
-28 + 3x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-7 + -1x)(4 + -1x) = 0

Subproblem 1

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

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 = {-7, 4}

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