5x^2+2x+15=0

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Solution for 5x^2+2x+15=0 equation:


Simplifying
5x2 + 2x + 15 = 0

Reorder the terms:
15 + 2x + 5x2 = 0

Solving
15 + 2x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
3 + 0.4x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 0.4x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 0.4x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 0.4x + x2 = 0 + -3
0.4x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
0.4x + x2 = -3

The x term is 0.4x.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4x + 0.04 + x2 = -3 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = -3 + 0.04

Combine like terms: -3 + 0.04 = -2.96
0.04 + 0.4x + x2 = -2.96

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = -2.96

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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