5t(t+15)-3(t+2)=0

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Solution for 5t(t+15)-3(t+2)=0 equation:


Simplifying
5t(t + 15) + -3(t + 2) = 0

Reorder the terms:
5t(15 + t) + -3(t + 2) = 0
(15 * 5t + t * 5t) + -3(t + 2) = 0
(75t + 5t2) + -3(t + 2) = 0

Reorder the terms:
75t + 5t2 + -3(2 + t) = 0
75t + 5t2 + (2 * -3 + t * -3) = 0
75t + 5t2 + (-6 + -3t) = 0

Reorder the terms:
-6 + 75t + -3t + 5t2 = 0

Combine like terms: 75t + -3t = 72t
-6 + 72t + 5t2 = 0

Solving
-6 + 72t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
-1.2 + 14.4t + t2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 14.4t + 1.2 + t2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 14.4t + t2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 14.4t + t2 = 0 + 1.2
14.4t + t2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
14.4t + t2 = 1.2

The t term is 14.4t.  Take half its coefficient (7.2).
Square it (51.84) and add it to both sides.

Add '51.84' to each side of the equation.
14.4t + 51.84 + t2 = 1.2 + 51.84

Reorder the terms:
51.84 + 14.4t + t2 = 1.2 + 51.84

Combine like terms: 1.2 + 51.84 = 53.04
51.84 + 14.4t + t2 = 53.04

Factor a perfect square on the left side:
(t + 7.2)(t + 7.2) = 53.04

Calculate the square root of the right side: 7.282856582

Break this problem into two subproblems by setting 
(t + 7.2) equal to 7.282856582 and -7.282856582.

Subproblem 1

t + 7.2 = 7.282856582 Simplifying t + 7.2 = 7.282856582 Reorder the terms: 7.2 + t = 7.282856582 Solving 7.2 + t = 7.282856582 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-7.2' to each side of the equation. 7.2 + -7.2 + t = 7.282856582 + -7.2 Combine like terms: 7.2 + -7.2 = 0.0 0.0 + t = 7.282856582 + -7.2 t = 7.282856582 + -7.2 Combine like terms: 7.282856582 + -7.2 = 0.082856582 t = 0.082856582 Simplifying t = 0.082856582

Subproblem 2

t + 7.2 = -7.282856582 Simplifying t + 7.2 = -7.282856582 Reorder the terms: 7.2 + t = -7.282856582 Solving 7.2 + t = -7.282856582 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-7.2' to each side of the equation. 7.2 + -7.2 + t = -7.282856582 + -7.2 Combine like terms: 7.2 + -7.2 = 0.0 0.0 + t = -7.282856582 + -7.2 t = -7.282856582 + -7.2 Combine like terms: -7.282856582 + -7.2 = -14.482856582 t = -14.482856582 Simplifying t = -14.482856582

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.082856582, -14.482856582}

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