2x*x-5x=-18

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Solution for 2x*x-5x=-18 equation:


Simplifying
2x * x + -5x = -18

Multiply x * x
2x2 + -5x = -18

Reorder the terms:
-5x + 2x2 = -18

Solving
-5x + 2x2 = -18

Solving for variable 'x'.

Reorder the terms:
18 + -5x + 2x2 = -18 + 18

Combine like terms: -18 + 18 = 0
18 + -5x + 2x2 = 0

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

Divide each side by '2'.
9 + -2.5x + x2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -2.5x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -2.5x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -2.5x + x2 = 0 + -9
-2.5x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-2.5x + x2 = -9

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 = -9 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = -9 + 1.5625

Combine like terms: -9 + 1.5625 = -7.4375
1.5625 + -2.5x + x2 = -7.4375

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = -7.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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