169=70t-5t^2

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Solution for 169=70t-5t^2 equation:


Simplifying
169 = 70t + -5t2

Solving
169 = 70t + -5t2

Solving for variable 't'.

Reorder the terms:
169 + -70t + 5t2 = 70t + -70t + -5t2 + 5t2

Combine like terms: 70t + -70t = 0
169 + -70t + 5t2 = 0 + -5t2 + 5t2
169 + -70t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
169 + -70t + 5t2 = 0

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

Divide each side by '5'.
33.8 + -14t + t2 = 0

Move the constant term to the right:

Add '-33.8' to each side of the equation.
33.8 + -14t + -33.8 + t2 = 0 + -33.8

Reorder the terms:
33.8 + -33.8 + -14t + t2 = 0 + -33.8

Combine like terms: 33.8 + -33.8 = 0.0
0.0 + -14t + t2 = 0 + -33.8
-14t + t2 = 0 + -33.8

Combine like terms: 0 + -33.8 = -33.8
-14t + t2 = -33.8

The t term is -14t.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14t + 49 + t2 = -33.8 + 49

Reorder the terms:
49 + -14t + t2 = -33.8 + 49

Combine like terms: -33.8 + 49 = 15.2
49 + -14t + t2 = 15.2

Factor a perfect square on the left side:
(t + -7)(t + -7) = 15.2

Calculate the square root of the right side: 3.898717738

Break this problem into two subproblems by setting 
(t + -7) equal to 3.898717738 and -3.898717738.

Subproblem 1

t + -7 = 3.898717738 Simplifying t + -7 = 3.898717738 Reorder the terms: -7 + t = 3.898717738 Solving -7 + t = 3.898717738 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + t = 3.898717738 + 7 Combine like terms: -7 + 7 = 0 0 + t = 3.898717738 + 7 t = 3.898717738 + 7 Combine like terms: 3.898717738 + 7 = 10.898717738 t = 10.898717738 Simplifying t = 10.898717738

Subproblem 2

t + -7 = -3.898717738 Simplifying t + -7 = -3.898717738 Reorder the terms: -7 + t = -3.898717738 Solving -7 + t = -3.898717738 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + t = -3.898717738 + 7 Combine like terms: -7 + 7 = 0 0 + t = -3.898717738 + 7 t = -3.898717738 + 7 Combine like terms: -3.898717738 + 7 = 3.101282262 t = 3.101282262 Simplifying t = 3.101282262

Solution

The solution to the problem is based on the solutions from the subproblems. t = {10.898717738, 3.101282262}

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