y=4(x+-3)(x+7)

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Solution for y=4(x+-3)(x+7) equation: 


Simplifying
y = 4(x + -3)(x + 7)

Reorder the terms:
y = 4(-3 + x)(x + 7)

Reorder the terms:
y = 4(-3 + x)(7 + x)

Multiply (-3 + x) * (7 + x)
y = 4(-3(7 + x) + x(7 + x))
y = 4((7 * -3 + x * -3) + x(7 + x))
y = 4((-21 + -3x) + x(7 + x))
y = 4(-21 + -3x + (7 * x + x * x))
y = 4(-21 + -3x + (7x + x2))

Combine like terms: -3x + 7x = 4x
y = 4(-21 + 4x + x2)
y = (-21 * 4 + 4x * 4 + x2 * 4)
y = (-84 + 16x + 4x2)

Solving
y = -84 + 16x + 4x2

Solving for variable 'y'.

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

Simplifying
y = -84 + 16x + 4x2

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