21y^2-16y-16=0

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Solution for 21y^2-16y-16=0 equation:


Simplifying
21y2 + -16y + -16 = 0

Reorder the terms:
-16 + -16y + 21y2 = 0

Solving
-16 + -16y + 21y2 = 0

Solving for variable 'y'.

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

Subproblem 1

Set the factor '(-4 + -7y)' equal to zero and attempt to solve: Simplifying -4 + -7y = 0 Solving -4 + -7y = 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 + -7y = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -7y = 0 + 4 -7y = 0 + 4 Combine like terms: 0 + 4 = 4 -7y = 4 Divide each side by '-7'. y = -0.5714285714 Simplifying y = -0.5714285714

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 = {-0.5714285714, 1.333333333}

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