2a^2-9a=81

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Solution for 2a^2-9a=81 equation:


Simplifying
2a2 + -9a = 81

Reorder the terms:
-9a + 2a2 = 81

Solving
-9a + 2a2 = 81

Solving for variable 'a'.

Reorder the terms:
-81 + -9a + 2a2 = 81 + -81

Combine like terms: 81 + -81 = 0
-81 + -9a + 2a2 = 0

Factor a trinomial.
(-9 + -2a)(9 + -1a) = 0

Subproblem 1

Set the factor '(-9 + -2a)' equal to zero and attempt to solve: Simplifying -9 + -2a = 0 Solving -9 + -2a = 0 Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -2a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -2a = 0 + 9 -2a = 0 + 9 Combine like terms: 0 + 9 = 9 -2a = 9 Divide each side by '-2'. a = -4.5 Simplifying a = -4.5

Subproblem 2

Set the factor '(9 + -1a)' equal to zero and attempt to solve: Simplifying 9 + -1a = 0 Solving 9 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1a = 0 + -9 -1a = 0 + -9 Combine like terms: 0 + -9 = -9 -1a = -9 Divide each side by '-1'. a = 9 Simplifying a = 9

Solution

a = {-4.5, 9}

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