42a^2-17a=15

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Solution for 42a^2-17a=15 equation:


Simplifying
42a2 + -17a = 15

Reorder the terms:
-17a + 42a2 = 15

Solving
-17a + 42a2 = 15

Solving for variable 'a'.

Reorder the terms:
-15 + -17a + 42a2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -17a + 42a2 = 0

Factor a trinomial.
(-3 + -7a)(5 + -6a) = 0

Subproblem 1

Set the factor '(-3 + -7a)' equal to zero and attempt to solve: Simplifying -3 + -7a = 0 Solving -3 + -7a = 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 + -7a = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -7a = 0 + 3 -7a = 0 + 3 Combine like terms: 0 + 3 = 3 -7a = 3 Divide each side by '-7'. a = -0.4285714286 Simplifying a = -0.4285714286

Subproblem 2

Set the factor '(5 + -6a)' equal to zero and attempt to solve: Simplifying 5 + -6a = 0 Solving 5 + -6a = 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 + -6a = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -6a = 0 + -5 -6a = 0 + -5 Combine like terms: 0 + -5 = -5 -6a = -5 Divide each side by '-6'. a = 0.8333333333 Simplifying a = 0.8333333333

Solution

a = {-0.4285714286, 0.8333333333}

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