(x^2+2x)+(x^2-5x)=20

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Solution for (x^2+2x)+(x^2-5x)=20 equation:


Simplifying
(x2 + 2x) + (x2 + -5x) = 20

Reorder the terms:
(2x + x2) + (x2 + -5x) = 20

Remove parenthesis around (2x + x2)
2x + x2 + (x2 + -5x) = 20

Reorder the terms:
2x + x2 + (-5x + x2) = 20

Remove parenthesis around (-5x + x2)
2x + x2 + -5x + x2 = 20

Reorder the terms:
2x + -5x + x2 + x2 = 20

Combine like terms: 2x + -5x = -3x
-3x + x2 + x2 = 20

Combine like terms: x2 + x2 = 2x2
-3x + 2x2 = 20

Solving
-3x + 2x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + -3x + 2x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + -3x + 2x2 = 0

Factor a trinomial.
(-5 + -2x)(4 + -1x) = 0

Subproblem 1

Set the factor '(-5 + -2x)' equal to zero and attempt to solve: Simplifying -5 + -2x = 0 Solving -5 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -2x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2x = 0 + 5 -2x = 0 + 5 Combine like terms: 0 + 5 = 5 -2x = 5 Divide each side by '-2'. x = -2.5 Simplifying x = -2.5

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 = {-2.5, 4}

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