(2y-5)(y+4)=

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Solution for (2y-5)(y+4)= equation:


Simplifying
(2y + -5)(y + 4) = 0

Reorder the terms:
(-5 + 2y)(y + 4) = 0

Reorder the terms:
(-5 + 2y)(4 + y) = 0

Multiply (-5 + 2y) * (4 + y)
(-5(4 + y) + 2y * (4 + y)) = 0
((4 * -5 + y * -5) + 2y * (4 + y)) = 0
((-20 + -5y) + 2y * (4 + y)) = 0
(-20 + -5y + (4 * 2y + y * 2y)) = 0
(-20 + -5y + (8y + 2y2)) = 0

Combine like terms: -5y + 8y = 3y
(-20 + 3y + 2y2) = 0

Solving
-20 + 3y + 2y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-4 + -1y)(5 + -2y) = 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 '(5 + -2y)' equal to zero and attempt to solve: Simplifying 5 + -2y = 0 Solving 5 + -2y = 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 + -2y = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2y = 0 + -5 -2y = 0 + -5 Combine like terms: 0 + -5 = -5 -2y = -5 Divide each side by '-2'. y = 2.5 Simplifying y = 2.5

Solution

y = {-4, 2.5}

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