x(8x+2)=3x^2-6x+21

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Solution for x(8x+2)=3x^2-6x+21 equation:


Simplifying
x(8x + 2) = 3x2 + -6x + 21

Reorder the terms:
x(2 + 8x) = 3x2 + -6x + 21
(2 * x + 8x * x) = 3x2 + -6x + 21
(2x + 8x2) = 3x2 + -6x + 21

Reorder the terms:
2x + 8x2 = 21 + -6x + 3x2

Solving
2x + 8x2 = 21 + -6x + 3x2

Solving for variable 'x'.

Reorder the terms:
-21 + 2x + 6x + 8x2 + -3x2 = 21 + -6x + 3x2 + -21 + 6x + -3x2

Combine like terms: 2x + 6x = 8x
-21 + 8x + 8x2 + -3x2 = 21 + -6x + 3x2 + -21 + 6x + -3x2

Combine like terms: 8x2 + -3x2 = 5x2
-21 + 8x + 5x2 = 21 + -6x + 3x2 + -21 + 6x + -3x2

Reorder the terms:
-21 + 8x + 5x2 = 21 + -21 + -6x + 6x + 3x2 + -3x2

Combine like terms: 21 + -21 = 0
-21 + 8x + 5x2 = 0 + -6x + 6x + 3x2 + -3x2
-21 + 8x + 5x2 = -6x + 6x + 3x2 + -3x2

Combine like terms: -6x + 6x = 0
-21 + 8x + 5x2 = 0 + 3x2 + -3x2
-21 + 8x + 5x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
-21 + 8x + 5x2 = 0

Factor a trinomial.
(-3 + -1x)(7 + -5x) = 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 + -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 = {-3, 1.4}

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