8y^2+17y=21

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Solution for 8y^2+17y=21 equation:


Simplifying
8y2 + 17y = 21

Reorder the terms:
17y + 8y2 = 21

Solving
17y + 8y2 = 21

Solving for variable 'y'.

Reorder the terms:
-21 + 17y + 8y2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + 17y + 8y2 = 0

Factor a trinomial.
(-3 + -1y)(7 + -8y) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(7 + -8y)' equal to zero and attempt to solve: Simplifying 7 + -8y = 0 Solving 7 + -8y = 0 Move all terms containing y to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -8y = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -8y = 0 + -7 -8y = 0 + -7 Combine like terms: 0 + -7 = -7 -8y = -7 Divide each side by '-8'. y = 0.875 Simplifying y = 0.875

Solution

y = {-3, 0.875}

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