4x^2-5x-15=2x^2-8

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Solution for 4x^2-5x-15=2x^2-8 equation:


Simplifying
4x2 + -5x + -15 = 2x2 + -8

Reorder the terms:
-15 + -5x + 4x2 = 2x2 + -8

Reorder the terms:
-15 + -5x + 4x2 = -8 + 2x2

Solving
-15 + -5x + 4x2 = -8 + 2x2

Solving for variable 'x'.

Reorder the terms:
-15 + 8 + -5x + 4x2 + -2x2 = -8 + 2x2 + 8 + -2x2

Combine like terms: -15 + 8 = -7
-7 + -5x + 4x2 + -2x2 = -8 + 2x2 + 8 + -2x2

Combine like terms: 4x2 + -2x2 = 2x2
-7 + -5x + 2x2 = -8 + 2x2 + 8 + -2x2

Reorder the terms:
-7 + -5x + 2x2 = -8 + 8 + 2x2 + -2x2

Combine like terms: -8 + 8 = 0
-7 + -5x + 2x2 = 0 + 2x2 + -2x2
-7 + -5x + 2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-7 + -5x + 2x2 = 0

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

Subproblem 1

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

Subproblem 2

Set the factor '(7 + -2x)' equal to zero and attempt to solve: Simplifying 7 + -2x = 0 Solving 7 + -2x = 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 + -2x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -2x = 0 + -7 -2x = 0 + -7 Combine like terms: 0 + -7 = -7 -2x = -7 Divide each side by '-2'. x = 3.5 Simplifying x = 3.5

Solution

x = {-1, 3.5}

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