(5y+7)(4-y)=0whatisy

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Solution for (5y+7)(4-y)=0whatisy equation:


Simplifying
(5y + 7)(4 + -1y) = 0whatisy

Reorder the terms:
(7 + 5y)(4 + -1y) = 0whatisy

Multiply (7 + 5y) * (4 + -1y)
(7(4 + -1y) + 5y * (4 + -1y)) = 0whatisy
((4 * 7 + -1y * 7) + 5y * (4 + -1y)) = 0whatisy
((28 + -7y) + 5y * (4 + -1y)) = 0whatisy
(28 + -7y + (4 * 5y + -1y * 5y)) = 0whatisy
(28 + -7y + (20y + -5y2)) = 0whatisy

Combine like terms: -7y + 20y = 13y
(28 + 13y + -5y2) = 0whatisy

Anything times zero is zero.
28 + 13y + -5y2 = 0ahistwy

Solving
28 + 13y + -5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(4 + -1y)(7 + 5y) = 0

Subproblem 1

Set the factor '(4 + -1y)' equal to zero and attempt to solve: Simplifying 4 + -1y = 0 Solving 4 + -1y = 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 + -1y = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1y = 0 + -4 -1y = 0 + -4 Combine like terms: 0 + -4 = -4 -1y = -4 Divide each side by '-1'. y = 4 Simplifying y = 4

Subproblem 2

Set the factor '(7 + 5y)' equal to zero and attempt to solve: Simplifying 7 + 5y = 0 Solving 7 + 5y = 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 + 5y = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 5y = 0 + -7 5y = 0 + -7 Combine like terms: 0 + -7 = -7 5y = -7 Divide each side by '5'. y = -1.4 Simplifying y = -1.4

Solution

y = {4, -1.4}

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