40x^2+9=42x

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Solution for 40x^2+9=42x equation:


Simplifying
40x2 + 9 = 42x

Reorder the terms:
9 + 40x2 = 42x

Solving
9 + 40x2 = 42x

Solving for variable 'x'.

Reorder the terms:
9 + -42x + 40x2 = 42x + -42x

Combine like terms: 42x + -42x = 0
9 + -42x + 40x2 = 0

Factor a trinomial.
(3 + -10x)(3 + -4x) = 0

Subproblem 1

Set the factor '(3 + -10x)' equal to zero and attempt to solve: Simplifying 3 + -10x = 0 Solving 3 + -10x = 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 + -10x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -10x = 0 + -3 -10x = 0 + -3 Combine like terms: 0 + -3 = -3 -10x = -3 Divide each side by '-10'. x = 0.3 Simplifying x = 0.3

Subproblem 2

Set the factor '(3 + -4x)' equal to zero and attempt to solve: Simplifying 3 + -4x = 0 Solving 3 + -4x = 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 + -4x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -4x = 0 + -3 -4x = 0 + -3 Combine like terms: 0 + -3 = -3 -4x = -3 Divide each side by '-4'. x = 0.75 Simplifying x = 0.75

Solution

x = {0.3, 0.75}

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