a=21(x+2)(x-2)

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Solution for a=21(x+2)(x-2) equation: 


Simplifying
a = 21(x + 2)(x + -2)

Reorder the terms:
a = 21(2 + x)(x + -2)

Reorder the terms:
a = 21(2 + x)(-2 + x)

Multiply (2 + x) * (-2 + x)
a = 21(2(-2 + x) + x(-2 + x))
a = 21((-2 * 2 + x * 2) + x(-2 + x))
a = 21((-4 + 2x) + x(-2 + x))
a = 21(-4 + 2x + (-2 * x + x * x))
a = 21(-4 + 2x + (-2x + x2))

Combine like terms: 2x + -2x = 0
a = 21(-4 + 0 + x2)
a = 21(-4 + x2)
a = (-4 * 21 + x2 * 21)
a = (-84 + 21x2)

Solving
a = -84 + 21x2

Solving for variable 'a'.

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

Simplifying
a = -84 + 21x2

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