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

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


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

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

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

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

Combine like terms: -4x + 9x = 5x
y = (36 + 5x + -1x2)

Solving
y = 36 + 5x + -1x2

Solving for variable 'y'.

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

Simplifying
y = 36 + 5x + -1x2

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