2x^2-x-3=7

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Solution for 2x^2-x-3=7 equation:


Simplifying
2x2 + -1x + -3 = 7

Reorder the terms:
-3 + -1x + 2x2 = 7

Solving
-3 + -1x + 2x2 = 7

Solving for variable 'x'.

Reorder the terms:
-3 + -7 + -1x + 2x2 = 7 + -7

Combine like terms: -3 + -7 = -10
-10 + -1x + 2x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-10 + -1x + 2x2 = 0

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

Subproblem 1

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

Subproblem 2

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

Solution

x = {-2, 2.5}

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