42x^2=-31x+21

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Solution for 42x^2=-31x+21 equation:


Simplifying
42x2 = -31x + 21

Reorder the terms:
42x2 = 21 + -31x

Solving
42x2 = 21 + -31x

Solving for variable 'x'.

Reorder the terms:
-21 + 31x + 42x2 = 21 + -31x + -21 + 31x

Reorder the terms:
-21 + 31x + 42x2 = 21 + -21 + -31x + 31x

Combine like terms: 21 + -21 = 0
-21 + 31x + 42x2 = 0 + -31x + 31x
-21 + 31x + 42x2 = -31x + 31x

Combine like terms: -31x + 31x = 0
-21 + 31x + 42x2 = 0

Factor a trinomial.
(-7 + -6x)(3 + -7x) = 0

Subproblem 1

Set the factor '(-7 + -6x)' equal to zero and attempt to solve: Simplifying -7 + -6x = 0 Solving -7 + -6x = 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 + -6x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -6x = 0 + 7 -6x = 0 + 7 Combine like terms: 0 + 7 = 7 -6x = 7 Divide each side by '-6'. x = -1.166666667 Simplifying x = -1.166666667

Subproblem 2

Set the factor '(3 + -7x)' equal to zero and attempt to solve: Simplifying 3 + -7x = 0 Solving 3 + -7x = 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 + -7x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -7x = 0 + -3 -7x = 0 + -3 Combine like terms: 0 + -3 = -3 -7x = -3 Divide each side by '-7'. x = 0.4285714286 Simplifying x = 0.4285714286

Solution

x = {-1.166666667, 0.4285714286}

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