15-x(4x-5)=71

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Solution for 15-x(4x-5)=71 equation:


Simplifying
15 + -1x(4x + -5) = 71

Reorder the terms:
15 + -1x(-5 + 4x) = 71
15 + (-5 * -1x + 4x * -1x) = 71
15 + (5x + -4x2) = 71

Solving
15 + 5x + -4x2 = 71

Solving for variable 'x'.

Reorder the terms:
15 + -71 + 5x + -4x2 = 71 + -71

Combine like terms: 15 + -71 = -56
-56 + 5x + -4x2 = 71 + -71

Combine like terms: 71 + -71 = 0
-56 + 5x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
14 + -1.25x + x2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + -1.25x + -14 + x2 = 0 + -14

Reorder the terms:
14 + -14 + -1.25x + x2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -1.25x + x2 = 0 + -14
-1.25x + x2 = 0 + -14

Combine like terms: 0 + -14 = -14
-1.25x + x2 = -14

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = -14 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = -14 + 0.390625

Combine like terms: -14 + 0.390625 = -13.609375
0.390625 + -1.25x + x2 = -13.609375

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = -13.609375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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