9q^2-2q=8q^2-6q+21

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Solution for 9q^2-2q=8q^2-6q+21 equation:


Simplifying
9q2 + -2q = 8q2 + -6q + 21

Reorder the terms:
-2q + 9q2 = 8q2 + -6q + 21

Reorder the terms:
-2q + 9q2 = 21 + -6q + 8q2

Solving
-2q + 9q2 = 21 + -6q + 8q2

Solving for variable 'q'.

Reorder the terms:
-21 + -2q + 6q + 9q2 + -8q2 = 21 + -6q + 8q2 + -21 + 6q + -8q2

Combine like terms: -2q + 6q = 4q
-21 + 4q + 9q2 + -8q2 = 21 + -6q + 8q2 + -21 + 6q + -8q2

Combine like terms: 9q2 + -8q2 = 1q2
-21 + 4q + 1q2 = 21 + -6q + 8q2 + -21 + 6q + -8q2

Reorder the terms:
-21 + 4q + 1q2 = 21 + -21 + -6q + 6q + 8q2 + -8q2

Combine like terms: 21 + -21 = 0
-21 + 4q + 1q2 = 0 + -6q + 6q + 8q2 + -8q2
-21 + 4q + 1q2 = -6q + 6q + 8q2 + -8q2

Combine like terms: -6q + 6q = 0
-21 + 4q + 1q2 = 0 + 8q2 + -8q2
-21 + 4q + 1q2 = 8q2 + -8q2

Combine like terms: 8q2 + -8q2 = 0
-21 + 4q + 1q2 = 0

Factor a trinomial.
(-7 + -1q)(3 + -1q) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(3 + -1q)' equal to zero and attempt to solve: Simplifying 3 + -1q = 0 Solving 3 + -1q = 0 Move all terms containing q to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1q = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1q = 0 + -3 -1q = 0 + -3 Combine like terms: 0 + -3 = -3 -1q = -3 Divide each side by '-1'. q = 3 Simplifying q = 3

Solution

q = {-7, 3}

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