y=-(x+4)(x+9)

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


Simplifying
y = -1(x + 4)(x + 9)

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

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

Multiply (4 + x) * (9 + x)
y = -1(4(9 + x) + x(9 + x))
y = -1((9 * 4 + x * 4) + x(9 + x))
y = -1((36 + 4x) + x(9 + x))
y = -1(36 + 4x + (9 * x + x * x))
y = -1(36 + 4x + (9x + x2))

Combine like terms: 4x + 9x = 13x
y = -1(36 + 13x + x2)
y = (36 * -1 + 13x * -1 + x2 * -1)
y = (-36 + -13x + -1x2)

Solving
y = -36 + -13x + -1x2

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Simplifying
y = -36 + -13x + -1x2

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