t^2+3t+15=0

Solution for t^2+3t+15=0 equation:

Simplifying
t2 + 3t + 15 = 0

Reorder the terms:
15 + 3t + t2 = 0

Solving
15 + 3t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + 3t + -15 + t2 = 0 + -15

Reorder the terms:
15 + -15 + 3t + t2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 3t + t2 = 0 + -15
3t + t2 = 0 + -15

Combine like terms: 0 + -15 = -15
3t + t2 = -15

The t term is 3t.  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.
3t + 2.25 + t2 = -15 + 2.25

Reorder the terms:
2.25 + 3t + t2 = -15 + 2.25

Combine like terms: -15 + 2.25 = -12.75
2.25 + 3t + t2 = -12.75

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

Can't calculate square root of the right side.

The solution to this equation could not be determined.