2a^2+7a=15

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Solution for 2a^2+7a=15 equation:


Simplifying
2a2 + 7a = 15

Reorder the terms:
7a + 2a2 = 15

Solving
7a + 2a2 = 15

Solving for variable 'a'.

Reorder the terms:
-15 + 7a + 2a2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 7a + 2a2 = 0

Factor a trinomial.
(-5 + -1a)(3 + -2a) = 0

Subproblem 1

Set the factor '(-5 + -1a)' equal to zero and attempt to solve: Simplifying -5 + -1a = 0 Solving -5 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1a = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1a = 0 + 5 -1a = 0 + 5 Combine like terms: 0 + 5 = 5 -1a = 5 Divide each side by '-1'. a = -5 Simplifying a = -5

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 = {-5, 1.5}

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