(4y+7)(9-y)=0

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Solution for (4y+7)(9-y)=0 equation: 


Simplifying
(4y + 7)(9 + -1y) = 0

Reorder the terms:
(7 + 4y)(9 + -1y) = 0

Multiply (7 + 4y) * (9 + -1y)
(7(9 + -1y) + 4y * (9 + -1y)) = 0
((9 * 7 + -1y * 7) + 4y * (9 + -1y)) = 0
((63 + -7y) + 4y * (9 + -1y)) = 0
(63 + -7y + (9 * 4y + -1y * 4y)) = 0
(63 + -7y + (36y + -4y2)) = 0

Combine like terms: -7y + 36y = 29y
(63 + 29y + -4y2) = 0

Solving
63 + 29y + -4y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(9 + -1y)(7 + 4y) = 0


Subproblem 1
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

Subproblem 2
Set the factor '(7 + 4y)' equal to zero and attempt to solve:

Simplifying
7 + 4y = 0

Solving
7 + 4y = 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 + 4y = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 4y = 0 + -7
4y = 0 + -7

Combine like terms: 0 + -7 = -7
4y = -7

Divide each side by '4'.
y = -1.75

Simplifying
y = -1.75
Solution
y = {9, -1.75}

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