(y-4)(y+15)=

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Solution for (y-4)(y+15)= equation:


Simplifying
(y + -4)(y + 15) = 0

Reorder the terms:
(-4 + y)(y + 15) = 0

Reorder the terms:
(-4 + y)(15 + y) = 0

Multiply (-4 + y) * (15 + y)
(-4(15 + y) + y(15 + y)) = 0
((15 * -4 + y * -4) + y(15 + y)) = 0
((-60 + -4y) + y(15 + y)) = 0
(-60 + -4y + (15 * y + y * y)) = 0
(-60 + -4y + (15y + y2)) = 0

Combine like terms: -4y + 15y = 11y
(-60 + 11y + y2) = 0

Solving
-60 + 11y + y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-15 + -1y)(4 + -1y) = 0

Subproblem 1

Set the factor '(-15 + -1y)' equal to zero and attempt to solve: Simplifying -15 + -1y = 0 Solving -15 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -1y = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -1y = 0 + 15 -1y = 0 + 15 Combine like terms: 0 + 15 = 15 -1y = 15 Divide each side by '-1'. y = -15 Simplifying y = -15

Subproblem 2

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

Solution

y = {-15, 4}

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