-69.8=-4.905t^2+1.35t

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Solution for -69.8=-4.905t^2+1.35t equation:


Simplifying
-69.8 = -4.905t2 + 1.35t

Reorder the terms:
-69.8 = 1.35t + -4.905t2

Solving
-69.8 = 1.35t + -4.905t2

Solving for variable 't'.

Reorder the terms:
-69.8 + -1.35t + 4.905t2 = 1.35t + -1.35t + -4.905t2 + 4.905t2

Combine like terms: 1.35t + -1.35t = 0.00
-69.8 + -1.35t + 4.905t2 = 0.00 + -4.905t2 + 4.905t2
-69.8 + -1.35t + 4.905t2 = -4.905t2 + 4.905t2

Combine like terms: -4.905t2 + 4.905t2 = 0.000
-69.8 + -1.35t + 4.905t2 = 0.000

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

Divide each side by '4.905'.
-14.23037717 + -0.2752293578t + t2 = 0

Move the constant term to the right:

Add '14.23037717' to each side of the equation.
-14.23037717 + -0.2752293578t + 14.23037717 + t2 = 0 + 14.23037717

Reorder the terms:
-14.23037717 + 14.23037717 + -0.2752293578t + t2 = 0 + 14.23037717

Combine like terms: -14.23037717 + 14.23037717 = 0.00000000
0.00000000 + -0.2752293578t + t2 = 0 + 14.23037717
-0.2752293578t + t2 = 0 + 14.23037717

Combine like terms: 0 + 14.23037717 = 14.23037717
-0.2752293578t + t2 = 14.23037717

The t term is -0.2752293578t.  Take half its coefficient (-0.1376146789).
Square it (0.01893779985) and add it to both sides.

Add '0.01893779985' to each side of the equation.
-0.2752293578t + 0.01893779985 + t2 = 14.23037717 + 0.01893779985

Reorder the terms:
0.01893779985 + -0.2752293578t + t2 = 14.23037717 + 0.01893779985

Combine like terms: 14.23037717 + 0.01893779985 = 14.24931496985
0.01893779985 + -0.2752293578t + t2 = 14.24931496985

Factor a perfect square on the left side:
(t + -0.1376146789)(t + -0.1376146789) = 14.24931496985

Calculate the square root of the right side: 3.774826482

Break this problem into two subproblems by setting 
(t + -0.1376146789) equal to 3.774826482 and -3.774826482.

Subproblem 1

t + -0.1376146789 = 3.774826482 Simplifying t + -0.1376146789 = 3.774826482 Reorder the terms: -0.1376146789 + t = 3.774826482 Solving -0.1376146789 + t = 3.774826482 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.1376146789' to each side of the equation. -0.1376146789 + 0.1376146789 + t = 3.774826482 + 0.1376146789 Combine like terms: -0.1376146789 + 0.1376146789 = 0.0000000000 0.0000000000 + t = 3.774826482 + 0.1376146789 t = 3.774826482 + 0.1376146789 Combine like terms: 3.774826482 + 0.1376146789 = 3.9124411609 t = 3.9124411609 Simplifying t = 3.9124411609

Subproblem 2

t + -0.1376146789 = -3.774826482 Simplifying t + -0.1376146789 = -3.774826482 Reorder the terms: -0.1376146789 + t = -3.774826482 Solving -0.1376146789 + t = -3.774826482 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.1376146789' to each side of the equation. -0.1376146789 + 0.1376146789 + t = -3.774826482 + 0.1376146789 Combine like terms: -0.1376146789 + 0.1376146789 = 0.0000000000 0.0000000000 + t = -3.774826482 + 0.1376146789 t = -3.774826482 + 0.1376146789 Combine like terms: -3.774826482 + 0.1376146789 = -3.6372118031 t = -3.6372118031 Simplifying t = -3.6372118031

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.9124411609, -3.6372118031}

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