z^2=(z-4)(z+5)

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Solution for z^2=(z-4)(z+5) equation:


Simplifying
z2 = (z + -4)(z + 5)

Reorder the terms:
z2 = (-4 + z)(z + 5)

Reorder the terms:
z2 = (-4 + z)(5 + z)

Multiply (-4 + z) * (5 + z)
z2 = (-4(5 + z) + z(5 + z))
z2 = ((5 * -4 + z * -4) + z(5 + z))
z2 = ((-20 + -4z) + z(5 + z))
z2 = (-20 + -4z + (5 * z + z * z))
z2 = (-20 + -4z + (5z + z2))

Combine like terms: -4z + 5z = 1z
z2 = (-20 + 1z + z2)

Add '-1z2' to each side of the equation.
z2 + -1z2 = -20 + 1z + z2 + -1z2

Combine like terms: z2 + -1z2 = 0
0 = -20 + 1z + z2 + -1z2

Combine like terms: z2 + -1z2 = 0
0 = -20 + 1z + 0
0 = -20 + 1z

Solving
0 = -20 + 1z

Solving for variable 'z'.

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

Add '-1z' to each side of the equation.
0 + -1z = -20 + 1z + -1z
Remove the zero:
-1z = -20 + 1z + -1z

Combine like terms: 1z + -1z = 0
-1z = -20 + 0
-1z = -20

Divide each side by '-1'.
z = 20

Simplifying
z = 20

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