-0.7t^2+16.8t=66.5

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Solution for -0.7t^2+16.8t=66.5 equation:


Simplifying
-0.7t2 + 16.8t = 66.5

Reorder the terms:
16.8t + -0.7t2 = 66.5

Solving
16.8t + -0.7t2 = 66.5

Solving for variable 't'.

Reorder the terms:
-66.5 + 16.8t + -0.7t2 = 66.5 + -66.5

Combine like terms: 66.5 + -66.5 = 0.0
-66.5 + 16.8t + -0.7t2 = 0.0

Begin completing the square.  Divide all terms by
-0.7 the coefficient of the squared term: 

Divide each side by '-0.7'.
95 + -24t + t2 = 0

Move the constant term to the right:

Add '-95' to each side of the equation.
95 + -24t + -95 + t2 = 0 + -95

Reorder the terms:
95 + -95 + -24t + t2 = 0 + -95

Combine like terms: 95 + -95 = 0
0 + -24t + t2 = 0 + -95
-24t + t2 = 0 + -95

Combine like terms: 0 + -95 = -95
-24t + t2 = -95

The t term is -24t.  Take half its coefficient (-12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
-24t + 144 + t2 = -95 + 144

Reorder the terms:
144 + -24t + t2 = -95 + 144

Combine like terms: -95 + 144 = 49
144 + -24t + t2 = 49

Factor a perfect square on the left side:
(t + -12)(t + -12) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(t + -12) equal to 7 and -7.

Subproblem 1

t + -12 = 7 Simplifying t + -12 = 7 Reorder the terms: -12 + t = 7 Solving -12 + t = 7 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + t = 7 + 12 Combine like terms: -12 + 12 = 0 0 + t = 7 + 12 t = 7 + 12 Combine like terms: 7 + 12 = 19 t = 19 Simplifying t = 19

Subproblem 2

t + -12 = -7 Simplifying t + -12 = -7 Reorder the terms: -12 + t = -7 Solving -12 + t = -7 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + t = -7 + 12 Combine like terms: -12 + 12 = 0 0 + t = -7 + 12 t = -7 + 12 Combine like terms: -7 + 12 = 5 t = 5 Simplifying t = 5

Solution

The solution to the problem is based on the solutions from the subproblems. t = {19, 5}

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