21y^2-17y-8=0

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Solution for 21y^2-17y-8=0 equation:


Simplifying
21y2 + -17y + -8 = 0

Reorder the terms:
-8 + -17y + 21y2 = 0

Solving
-8 + -17y + 21y2 = 0

Solving for variable 'y'.

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

Subproblem 1

Set the factor '(-1 + -3y)' equal to zero and attempt to solve: Simplifying -1 + -3y = 0 Solving -1 + -3y = 0 Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -3y = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -3y = 0 + 1 -3y = 0 + 1 Combine like terms: 0 + 1 = 1 -3y = 1 Divide each side by '-3'. y = -0.3333333333 Simplifying y = -0.3333333333

Subproblem 2

Set the factor '(8 + -7y)' equal to zero and attempt to solve: Simplifying 8 + -7y = 0 Solving 8 + -7y = 0 Move all terms containing y to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -7y = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -7y = 0 + -8 -7y = 0 + -8 Combine like terms: 0 + -8 = -8 -7y = -8 Divide each side by '-7'. y = 1.142857143 Simplifying y = 1.142857143

Solution

y = {-0.3333333333, 1.142857143}

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