429.87=-2.67t^2+80.1t+0

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Solution for 429.87=-2.67t^2+80.1t+0 equation:


Simplifying
429.87 = -2.67t2 + 80.1t + 0

Reorder the terms:
429.87 = 0 + 80.1t + -2.67t2
Remove the zero:
429.87 = 80.1t + -2.67t2

Solving
429.87 = 80.1t + -2.67t2

Solving for variable 't'.

Reorder the terms:
429.87 + -80.1t + 2.67t2 = 80.1t + -80.1t + -2.67t2 + 2.67t2

Combine like terms: 80.1t + -80.1t = 0.0
429.87 + -80.1t + 2.67t2 = 0.0 + -2.67t2 + 2.67t2
429.87 + -80.1t + 2.67t2 = -2.67t2 + 2.67t2

Combine like terms: -2.67t2 + 2.67t2 = 0.00
429.87 + -80.1t + 2.67t2 = 0.00

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

Divide each side by '2.67'.
161 + -30t + t2 = 0

Move the constant term to the right:

Add '-161' to each side of the equation.
161 + -30t + -161 + t2 = 0 + -161

Reorder the terms:
161 + -161 + -30t + t2 = 0 + -161

Combine like terms: 161 + -161 = 0
0 + -30t + t2 = 0 + -161
-30t + t2 = 0 + -161

Combine like terms: 0 + -161 = -161
-30t + t2 = -161

The t term is -30t.  Take half its coefficient (-15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
-30t + 225 + t2 = -161 + 225

Reorder the terms:
225 + -30t + t2 = -161 + 225

Combine like terms: -161 + 225 = 64
225 + -30t + t2 = 64

Factor a perfect square on the left side:
(t + -15)(t + -15) = 64

Calculate the square root of the right side: 8

Break this problem into two subproblems by setting 
(t + -15) equal to 8 and -8.

Subproblem 1

t + -15 = 8 Simplifying t + -15 = 8 Reorder the terms: -15 + t = 8 Solving -15 + t = 8 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + t = 8 + 15 Combine like terms: -15 + 15 = 0 0 + t = 8 + 15 t = 8 + 15 Combine like terms: 8 + 15 = 23 t = 23 Simplifying t = 23

Subproblem 2

t + -15 = -8 Simplifying t + -15 = -8 Reorder the terms: -15 + t = -8 Solving -15 + t = -8 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + t = -8 + 15 Combine like terms: -15 + 15 = 0 0 + t = -8 + 15 t = -8 + 15 Combine like terms: -8 + 15 = 7 t = 7 Simplifying t = 7

Solution

The solution to the problem is based on the solutions from the subproblems. t = {23, 7}

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