x^2-3x=-15

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Solution for x^2-3x=-15 equation:


Simplifying
x2 + -3x = -15

Reorder the terms:
-3x + x2 = -15

Solving
-3x + x2 = -15

Solving for variable 'x'.

Reorder the terms:
15 + -3x + x2 = -15 + 15

Combine like terms: -15 + 15 = 0
15 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + -3x + -15 + x2 = 0 + -15

Reorder the terms:
15 + -15 + -3x + x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -3x + x2 = 0 + -15
-3x + x2 = 0 + -15

Combine like terms: 0 + -15 = -15
-3x + x2 = -15

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = -15 + 2.25

Reorder the terms:
2.25 + -3x + x2 = -15 + 2.25

Combine like terms: -15 + 2.25 = -12.75
2.25 + -3x + x2 = -12.75

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = -12.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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