4x^2+20x+25=81

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Solution for 4x^2+20x+25=81 equation:


Simplifying
4x2 + 20x + 25 = 81

Reorder the terms:
25 + 20x + 4x2 = 81

Solving
25 + 20x + 4x2 = 81

Solving for variable 'x'.

Reorder the terms:
25 + -81 + 20x + 4x2 = 81 + -81

Combine like terms: 25 + -81 = -56
-56 + 20x + 4x2 = 81 + -81

Combine like terms: 81 + -81 = 0
-56 + 20x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-14 + 5x + x2) = 0

Factor a trinomial.
4((-7 + -1x)(2 + -1x)) = 0

Ignore the factor 4.

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 '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2

Solution

x = {-7, 2}

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