2x^2-4x-1=x^2+20

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Solution for 2x^2-4x-1=x^2+20 equation:


Simplifying
2x2 + -4x + -1 = x2 + 20

Reorder the terms:
-1 + -4x + 2x2 = x2 + 20

Reorder the terms:
-1 + -4x + 2x2 = 20 + x2

Solving
-1 + -4x + 2x2 = 20 + x2

Solving for variable 'x'.

Reorder the terms:
-1 + -20 + -4x + 2x2 + -1x2 = 20 + x2 + -20 + -1x2

Combine like terms: -1 + -20 = -21
-21 + -4x + 2x2 + -1x2 = 20 + x2 + -20 + -1x2

Combine like terms: 2x2 + -1x2 = 1x2
-21 + -4x + 1x2 = 20 + x2 + -20 + -1x2

Reorder the terms:
-21 + -4x + 1x2 = 20 + -20 + x2 + -1x2

Combine like terms: 20 + -20 = 0
-21 + -4x + 1x2 = 0 + x2 + -1x2
-21 + -4x + 1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-21 + -4x + 1x2 = 0

Factor a trinomial.
(-3 + -1x)(7 + -1x) = 0

Subproblem 1

Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3

Subproblem 2

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

Solution

x = {-3, 7}

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