8x^2=2x+21

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Solution for 8x^2=2x+21 equation:


Simplifying
8x2 = 2x + 21

Reorder the terms:
8x2 = 21 + 2x

Solving
8x2 = 21 + 2x

Solving for variable 'x'.

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

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

Combine like terms: 21 + -21 = 0
-21 + -2x + 8x2 = 0 + 2x + -2x
-21 + -2x + 8x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-21 + -2x + 8x2 = 0

Factor a trinomial.
(-3 + -2x)(7 + -4x) = 0

Subproblem 1

Set the factor '(-3 + -2x)' equal to zero and attempt to solve: Simplifying -3 + -2x = 0 Solving -3 + -2x = 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 + -2x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -2x = 0 + 3 -2x = 0 + 3 Combine like terms: 0 + 3 = 3 -2x = 3 Divide each side by '-2'. x = -1.5 Simplifying x = -1.5

Subproblem 2

Set the factor '(7 + -4x)' equal to zero and attempt to solve: Simplifying 7 + -4x = 0 Solving 7 + -4x = 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 + -4x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -4x = 0 + -7 -4x = 0 + -7 Combine like terms: 0 + -7 = -7 -4x = -7 Divide each side by '-4'. x = 1.75 Simplifying x = 1.75

Solution

x = {-1.5, 1.75}

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