8n^2+2n-21=0

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Solution for 8n^2+2n-21=0 equation:


Simplifying
8n2 + 2n + -21 = 0

Reorder the terms:
-21 + 2n + 8n2 = 0

Solving
-21 + 2n + 8n2 = 0

Solving for variable 'n'.

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

Subproblem 1

Set the factor '(-7 + -4n)' equal to zero and attempt to solve: Simplifying -7 + -4n = 0 Solving -7 + -4n = 0 Move all terms containing n to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -4n = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -4n = 0 + 7 -4n = 0 + 7 Combine like terms: 0 + 7 = 7 -4n = 7 Divide each side by '-4'. n = -1.75 Simplifying n = -1.75

Subproblem 2

Set the factor '(3 + -2n)' equal to zero and attempt to solve: Simplifying 3 + -2n = 0 Solving 3 + -2n = 0 Move all terms containing n to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -2n = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -2n = 0 + -3 -2n = 0 + -3 Combine like terms: 0 + -3 = -3 -2n = -3 Divide each side by '-2'. n = 1.5 Simplifying n = 1.5

Solution

n = {-1.75, 1.5}

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