-5t^2+40t+1.2=60

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Solution for -5t^2+40t+1.2=60 equation:


Simplifying
-5t2 + 40t + 1.2 = 60

Reorder the terms:
1.2 + 40t + -5t2 = 60

Solving
1.2 + 40t + -5t2 = 60

Solving for variable 't'.

Reorder the terms:
1.2 + -60 + 40t + -5t2 = 60 + -60

Combine like terms: 1.2 + -60 = -58.8
-58.8 + 40t + -5t2 = 60 + -60

Combine like terms: 60 + -60 = 0
-58.8 + 40t + -5t2 = 0

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

Divide each side by '-5'.
11.76 + -8t + t2 = 0

Move the constant term to the right:

Add '-11.76' to each side of the equation.
11.76 + -8t + -11.76 + t2 = 0 + -11.76

Reorder the terms:
11.76 + -11.76 + -8t + t2 = 0 + -11.76

Combine like terms: 11.76 + -11.76 = 0.00
0.00 + -8t + t2 = 0 + -11.76
-8t + t2 = 0 + -11.76

Combine like terms: 0 + -11.76 = -11.76
-8t + t2 = -11.76

The t term is -8t.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8t + 16 + t2 = -11.76 + 16

Reorder the terms:
16 + -8t + t2 = -11.76 + 16

Combine like terms: -11.76 + 16 = 4.24
16 + -8t + t2 = 4.24

Factor a perfect square on the left side:
(t + -4)(t + -4) = 4.24

Calculate the square root of the right side: 2.059126028

Break this problem into two subproblems by setting 
(t + -4) equal to 2.059126028 and -2.059126028.

Subproblem 1

t + -4 = 2.059126028 Simplifying t + -4 = 2.059126028 Reorder the terms: -4 + t = 2.059126028 Solving -4 + t = 2.059126028 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = 2.059126028 + 4 Combine like terms: -4 + 4 = 0 0 + t = 2.059126028 + 4 t = 2.059126028 + 4 Combine like terms: 2.059126028 + 4 = 6.059126028 t = 6.059126028 Simplifying t = 6.059126028

Subproblem 2

t + -4 = -2.059126028 Simplifying t + -4 = -2.059126028 Reorder the terms: -4 + t = -2.059126028 Solving -4 + t = -2.059126028 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = -2.059126028 + 4 Combine like terms: -4 + 4 = 0 0 + t = -2.059126028 + 4 t = -2.059126028 + 4 Combine like terms: -2.059126028 + 4 = 1.940873972 t = 1.940873972 Simplifying t = 1.940873972

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.059126028, 1.940873972}

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