42x^2-69x+20=7x^2-8

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Solution for 42x^2-69x+20=7x^2-8 equation:


Simplifying
42x2 + -69x + 20 = 7x2 + -8

Reorder the terms:
20 + -69x + 42x2 = 7x2 + -8

Reorder the terms:
20 + -69x + 42x2 = -8 + 7x2

Solving
20 + -69x + 42x2 = -8 + 7x2

Solving for variable 'x'.

Reorder the terms:
20 + 8 + -69x + 42x2 + -7x2 = -8 + 7x2 + 8 + -7x2

Combine like terms: 20 + 8 = 28
28 + -69x + 42x2 + -7x2 = -8 + 7x2 + 8 + -7x2

Combine like terms: 42x2 + -7x2 = 35x2
28 + -69x + 35x2 = -8 + 7x2 + 8 + -7x2

Reorder the terms:
28 + -69x + 35x2 = -8 + 8 + 7x2 + -7x2

Combine like terms: -8 + 8 = 0
28 + -69x + 35x2 = 0 + 7x2 + -7x2
28 + -69x + 35x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
28 + -69x + 35x2 = 0

Factor a trinomial.
(4 + -7x)(7 + -5x) = 0

Subproblem 1

Set the factor '(4 + -7x)' equal to zero and attempt to solve: Simplifying 4 + -7x = 0 Solving 4 + -7x = 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 + -7x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -7x = 0 + -4 -7x = 0 + -4 Combine like terms: 0 + -4 = -4 -7x = -4 Divide each side by '-7'. x = 0.5714285714 Simplifying x = 0.5714285714

Subproblem 2

Set the factor '(7 + -5x)' equal to zero and attempt to solve: Simplifying 7 + -5x = 0 Solving 7 + -5x = 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 + -5x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -5x = 0 + -7 -5x = 0 + -7 Combine like terms: 0 + -7 = -7 -5x = -7 Divide each side by '-5'. x = 1.4 Simplifying x = 1.4

Solution

x = {0.5714285714, 1.4}

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