y=(x+3)(x+9)

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Solution for y=(x+3)(x+9) equation: 


Simplifying
y = (x + 3)(x + 9)

Reorder the terms:
y = (3 + x)(x + 9)

Reorder the terms:
y = (3 + x)(9 + x)

Multiply (3 + x) * (9 + x)
y = (3(9 + x) + x(9 + x))
y = ((9 * 3 + x * 3) + x(9 + x))
y = ((27 + 3x) + x(9 + x))
y = (27 + 3x + (9 * x + x * x))
y = (27 + 3x + (9x + x2))

Combine like terms: 3x + 9x = 12x
y = (27 + 12x + x2)

Solving
y = 27 + 12x + x2

Solving for variable 'y'.

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

Simplifying
y = 27 + 12x + x2

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