y(y-4)=45

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Solution for y(y-4)=45 equation:


Simplifying
y(y + -4) = 45

Reorder the terms:
y(-4 + y) = 45
(-4 * y + y * y) = 45
(-4y + y2) = 45

Solving
-4y + y2 = 45

Solving for variable 'y'.

Reorder the terms:
-45 + -4y + y2 = 45 + -45

Combine like terms: 45 + -45 = 0
-45 + -4y + y2 = 0

Factor a trinomial.
(-5 + -1y)(9 + -1y) = 0

Subproblem 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 = -5

Subproblem 2

Set the factor '(9 + -1y)' equal to zero and attempt to solve: Simplifying 9 + -1y = 0 Solving 9 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1y = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1y = 0 + -9 -1y = 0 + -9 Combine like terms: 0 + -9 = -9 -1y = -9 Divide each side by '-1'. y = 9 Simplifying y = 9

Solution

y = {-5, 9}

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