780=4x^2+8x

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Solution for 780=4x^2+8x equation:


Simplifying
780 = 4x2 + 8x

Reorder the terms:
780 = 8x + 4x2

Solving
780 = 8x + 4x2

Solving for variable 'x'.

Reorder the terms:
780 + -8x + -4x2 = 8x + -8x + 4x2 + -4x2

Combine like terms: 8x + -8x = 0
780 + -8x + -4x2 = 0 + 4x2 + -4x2
780 + -8x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
780 + -8x + -4x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(195 + -2x + -1x2) = 0

Factor a trinomial.
4((13 + -1x)(15 + x)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(13 + -1x)' equal to zero and attempt to solve: Simplifying 13 + -1x = 0 Solving 13 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -1x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + -1x = 0 + -13 -1x = 0 + -13 Combine like terms: 0 + -13 = -13 -1x = -13 Divide each side by '-1'. x = 13 Simplifying x = 13

Subproblem 2

Set the factor '(15 + x)' equal to zero and attempt to solve: Simplifying 15 + x = 0 Solving 15 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + x = 0 + -15 x = 0 + -15 Combine like terms: 0 + -15 = -15 x = -15 Simplifying x = -15

Solution

x = {13, -15}

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