7x^2=42x-56

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Solution for 7x^2=42x-56 equation:


Simplifying
7x2 = 42x + -56

Reorder the terms:
7x2 = -56 + 42x

Solving
7x2 = -56 + 42x

Solving for variable 'x'.

Reorder the terms:
56 + -42x + 7x2 = -56 + 42x + 56 + -42x

Reorder the terms:
56 + -42x + 7x2 = -56 + 56 + 42x + -42x

Combine like terms: -56 + 56 = 0
56 + -42x + 7x2 = 0 + 42x + -42x
56 + -42x + 7x2 = 42x + -42x

Combine like terms: 42x + -42x = 0
56 + -42x + 7x2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(8 + -6x + x2) = 0

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

Ignore the factor 7.

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 '(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, 4}

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