0=8x^2-2x-21

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Solution for 0=8x^2-2x-21 equation:


Simplifying
0 = 8x2 + -2x + -21

Reorder the terms:
0 = -21 + -2x + 8x2

Solving
0 = -21 + -2x + 8x2

Solving for variable 'x'.

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

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

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

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

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

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

Subproblem 1

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

Subproblem 2

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

Solution

x = {1.75, -1.5}

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