2a^2-a-83=8

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Solution for 2a^2-a-83=8 equation:


Simplifying
2a2 + -1a + -83 = 8

Reorder the terms:
-83 + -1a + 2a2 = 8

Solving
-83 + -1a + 2a2 = 8

Solving for variable 'a'.

Reorder the terms:
-83 + -8 + -1a + 2a2 = 8 + -8

Combine like terms: -83 + -8 = -91
-91 + -1a + 2a2 = 8 + -8

Combine like terms: 8 + -8 = 0
-91 + -1a + 2a2 = 0

Factor a trinomial.
(-13 + -2a)(7 + -1a) = 0

Subproblem 1

Set the factor '(-13 + -2a)' equal to zero and attempt to solve: Simplifying -13 + -2a = 0 Solving -13 + -2a = 0 Move all terms containing a to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + -2a = 0 + 13 Combine like terms: -13 + 13 = 0 0 + -2a = 0 + 13 -2a = 0 + 13 Combine like terms: 0 + 13 = 13 -2a = 13 Divide each side by '-2'. a = -6.5 Simplifying a = -6.5

Subproblem 2

Set the factor '(7 + -1a)' equal to zero and attempt to solve: Simplifying 7 + -1a = 0 Solving 7 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1a = 0 + -7 -1a = 0 + -7 Combine like terms: 0 + -7 = -7 -1a = -7 Divide each side by '-1'. a = 7 Simplifying a = 7

Solution

a = {-6.5, 7}

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