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Simplifying 5(y2 + -4) = -21y Reorder the terms: 5(-4 + y2) = -21y (-4 * 5 + y2 * 5) = -21y (-20 + 5y2) = -21y Solving -20 + 5y2 = -21y Solving for variable 'y'. Reorder the terms: -20 + 21y + 5y2 = -21y + 21y Combine like terms: -21y + 21y = 0 -20 + 21y + 5y2 = 0 Factor a trinomial. (-5 + -1y)(4 + -5y) = 0Subproblem 1
Set the factor '(-5 + -1y)' equal to zero and attempt to solve: Simplifying -5 + -1y = 0 Solving -5 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1y = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1y = 0 + 5 -1y = 0 + 5 Combine like terms: 0 + 5 = 5 -1y = 5 Divide each side by '-1'. y = -5 Simplifying y = -5Subproblem 2
Set the factor '(4 + -5y)' equal to zero and attempt to solve: Simplifying 4 + -5y = 0 Solving 4 + -5y = 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 + -5y = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -5y = 0 + -4 -5y = 0 + -4 Combine like terms: 0 + -4 = -4 -5y = -4 Divide each side by '-5'. y = 0.8 Simplifying y = 0.8Solution
y = {-5, 0.8}
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