4k(k+3)=-15

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Solution for 4k(k+3)=-15 equation:


Simplifying
4k(k + 3) = -15

Reorder the terms:
4k(3 + k) = -15
(3 * 4k + k * 4k) = -15
(12k + 4k2) = -15

Solving
12k + 4k2 = -15

Solving for variable 'k'.

Reorder the terms:
15 + 12k + 4k2 = -15 + 15

Combine like terms: -15 + 15 = 0
15 + 12k + 4k2 = 0

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

Divide each side by '4'.
3.75 + 3k + k2 = 0

Move the constant term to the right:

Add '-3.75' to each side of the equation.
3.75 + 3k + -3.75 + k2 = 0 + -3.75

Reorder the terms:
3.75 + -3.75 + 3k + k2 = 0 + -3.75

Combine like terms: 3.75 + -3.75 = 0.00
0.00 + 3k + k2 = 0 + -3.75
3k + k2 = 0 + -3.75

Combine like terms: 0 + -3.75 = -3.75
3k + k2 = -3.75

The k term is 3k.  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.
3k + 2.25 + k2 = -3.75 + 2.25

Reorder the terms:
2.25 + 3k + k2 = -3.75 + 2.25

Combine like terms: -3.75 + 2.25 = -1.5
2.25 + 3k + k2 = -1.5

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

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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