128=-16x^2+64x+80

Solution for 128=-16x^2+64x+80 equation:

Simplifying
128 = -16x2 + 64x + 80

Reorder the terms:
128 = 80 + 64x + -16x2

Solving
128 = 80 + 64x + -16x2

Solving for variable 'x'.

Combine like terms: 128 + -80 = 48
48 + -64x + 16x2 = 80 + 64x + -16x2 + -80 + -64x + 16x2

Reorder the terms:
48 + -64x + 16x2 = 80 + -80 + 64x + -64x + -16x2 + 16x2

Combine like terms: 80 + -80 = 0
48 + -64x + 16x2 = 0 + 64x + -64x + -16x2 + 16x2
48 + -64x + 16x2 = 64x + -64x + -16x2 + 16x2

Combine like terms: 64x + -64x = 0
48 + -64x + 16x2 = 0 + -16x2 + 16x2
48 + -64x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
48 + -64x + 16x2 = 0

Factor out the Greatest Common Factor (GCF), '16'.
16(3 + -4x + x2) = 0

Factor a trinomial.
16((1 + -1x)(3 + -1x)) = 0

Ignore the factor 16.
Subproblem 1
Set the factor '(1 + -1x)' equal to zero and attempt to solve:

Simplifying
1 + -1x = 0

Solving
1 + -1x = 0

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

Add '-1' to each side of the equation.
1 + -1 + -1x = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -1x = 0 + -1
-1x = 0 + -1

Combine like terms: 0 + -1 = -1
-1x = -1

Divide each side by '-1'.
x = 1

Simplifying
x = 1
Subproblem 2
Set the factor '(3 + -1x)' equal to zero and attempt to solve:

Simplifying
3 + -1x = 0

Solving
3 + -1x = 0

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

Add '-3' to each side of the equation.
3 + -3 + -1x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1x = 0 + -3
-1x = 0 + -3

Combine like terms: 0 + -3 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3
Solution
x = {1, 3}