5x-2x^2=16

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Solution for 5x-2x^2=16 equation:


Simplifying
5x + -2x2 = 16

Solving
5x + -2x2 = 16

Solving for variable 'x'.

Reorder the terms:
-16 + 5x + -2x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + 5x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
8 + -2.5x + x2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -2.5x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + -2.5x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -2.5x + x2 = 0 + -8
-2.5x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
-2.5x + x2 = -8

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = -8 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = -8 + 1.5625

Combine like terms: -8 + 1.5625 = -6.4375
1.5625 + -2.5x + x2 = -6.4375

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = -6.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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