y=4(x+5)(x-5)

Solution for y=4(x+5)(x-5) equation:

Simplifying
y = 4(x + 5)(x + -5)

Reorder the terms:
y = 4(5 + x)(x + -5)

Reorder the terms:
y = 4(5 + x)(-5 + x)

Multiply (5 + x) * (-5 + x)
y = 4(5(-5 + x) + x(-5 + x))
y = 4((-5 * 5 + x * 5) + x(-5 + x))
y = 4((-25 + 5x) + x(-5 + x))
y = 4(-25 + 5x + (-5 * x + x * x))
y = 4(-25 + 5x + (-5x + x2))

Combine like terms: 5x + -5x = 0
y = 4(-25 + 0 + x2)
y = 4(-25 + x2)
y = (-25 * 4 + x2 * 4)
y = (-100 + 4x2)

Solving
y = -100 + 4x2

Solving for variable 'y'.

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

Simplifying
y = -100 + 4x2