21y^2-22y-8=0

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Solution for 21y^2-22y-8=0 equation:


Simplifying
21y2 + -22y + -8 = 0

Reorder the terms:
-8 + -22y + 21y2 = 0

Solving
-8 + -22y + 21y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-2 + -7y)(4 + -3y) = 0

Subproblem 1

Set the factor '(-2 + -7y)' equal to zero and attempt to solve: Simplifying -2 + -7y = 0 Solving -2 + -7y = 0 Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -7y = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -7y = 0 + 2 -7y = 0 + 2 Combine like terms: 0 + 2 = 2 -7y = 2 Divide each side by '-7'. y = -0.2857142857 Simplifying y = -0.2857142857

Subproblem 2

Set the factor '(4 + -3y)' equal to zero and attempt to solve: Simplifying 4 + -3y = 0 Solving 4 + -3y = 0 Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -3y = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -3y = 0 + -4 -3y = 0 + -4 Combine like terms: 0 + -4 = -4 -3y = -4 Divide each side by '-3'. y = 1.333333333 Simplifying y = 1.333333333

Solution

y = {-0.2857142857, 1.333333333}

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