15=-5t^2+4t+5

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Solution for 15=-5t^2+4t+5 equation:


Simplifying
15 = -5t2 + 4t + 5

Reorder the terms:
15 = 5 + 4t + -5t2

Solving
15 = 5 + 4t + -5t2

Solving for variable 't'.

Combine like terms: 15 + -5 = 10
10 + -4t + 5t2 = 5 + 4t + -5t2 + -5 + -4t + 5t2

Reorder the terms:
10 + -4t + 5t2 = 5 + -5 + 4t + -4t + -5t2 + 5t2

Combine like terms: 5 + -5 = 0
10 + -4t + 5t2 = 0 + 4t + -4t + -5t2 + 5t2
10 + -4t + 5t2 = 4t + -4t + -5t2 + 5t2

Combine like terms: 4t + -4t = 0
10 + -4t + 5t2 = 0 + -5t2 + 5t2
10 + -4t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
10 + -4t + 5t2 = 0

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

Divide each side by '5'.
2 + -0.8t + t2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -0.8t + -2 + t2 = 0 + -2

Reorder the terms:
2 + -2 + -0.8t + t2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -0.8t + t2 = 0 + -2
-0.8t + t2 = 0 + -2

Combine like terms: 0 + -2 = -2
-0.8t + t2 = -2

The t term is -0.8t.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8t + 0.16 + t2 = -2 + 0.16

Reorder the terms:
0.16 + -0.8t + t2 = -2 + 0.16

Combine like terms: -2 + 0.16 = -1.84
0.16 + -0.8t + t2 = -1.84

Factor a perfect square on the left side:
(t + -0.4)(t + -0.4) = -1.84

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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