40a^2-4a-84=0

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Solution for 40a^2-4a-84=0 equation:


Simplifying
40a2 + -4a + -84 = 0

Reorder the terms:
-84 + -4a + 40a2 = 0

Solving
-84 + -4a + 40a2 = 0

Solving for variable 'a'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-21 + -1a + 10a2) = 0

Factor a trinomial.
4((-7 + -5a)(3 + -2a)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-7 + -5a)' equal to zero and attempt to solve: Simplifying -7 + -5a = 0 Solving -7 + -5a = 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 + -5a = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -5a = 0 + 7 -5a = 0 + 7 Combine like terms: 0 + 7 = 7 -5a = 7 Divide each side by '-5'. a = -1.4 Simplifying a = -1.4

Subproblem 2

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

Solution

a = {-1.4, 1.5}

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