4.9t^2-5t-280=0

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Solution for 4.9t^2-5t-280=0 equation:


Simplifying
4.9t2 + -5t + -280 = 0

Reorder the terms:
-280 + -5t + 4.9t2 = 0

Solving
-280 + -5t + 4.9t2 = 0

Solving for variable 't'.

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

Divide each side by '4.9'.
-57.14285714 + -1.020408163t + t2 = 0

Move the constant term to the right:

Add '57.14285714' to each side of the equation.
-57.14285714 + -1.020408163t + 57.14285714 + t2 = 0 + 57.14285714

Reorder the terms:
-57.14285714 + 57.14285714 + -1.020408163t + t2 = 0 + 57.14285714

Combine like terms: -57.14285714 + 57.14285714 = 0.00000000
0.00000000 + -1.020408163t + t2 = 0 + 57.14285714
-1.020408163t + t2 = 0 + 57.14285714

Combine like terms: 0 + 57.14285714 = 57.14285714
-1.020408163t + t2 = 57.14285714

The t term is -1.020408163t.  Take half its coefficient (-0.5102040815).
Square it (0.2603082048) and add it to both sides.

Add '0.2603082048' to each side of the equation.
-1.020408163t + 0.2603082048 + t2 = 57.14285714 + 0.2603082048

Reorder the terms:
0.2603082048 + -1.020408163t + t2 = 57.14285714 + 0.2603082048

Combine like terms: 57.14285714 + 0.2603082048 = 57.4031653448
0.2603082048 + -1.020408163t + t2 = 57.4031653448

Factor a perfect square on the left side:
(t + -0.5102040815)(t + -0.5102040815) = 57.4031653448

Calculate the square root of the right side: 7.576487665

Break this problem into two subproblems by setting 
(t + -0.5102040815) equal to 7.576487665 and -7.576487665.

Subproblem 1

t + -0.5102040815 = 7.576487665 Simplifying t + -0.5102040815 = 7.576487665 Reorder the terms: -0.5102040815 + t = 7.576487665 Solving -0.5102040815 + t = 7.576487665 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5102040815' to each side of the equation. -0.5102040815 + 0.5102040815 + t = 7.576487665 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = 7.576487665 + 0.5102040815 t = 7.576487665 + 0.5102040815 Combine like terms: 7.576487665 + 0.5102040815 = 8.0866917465 t = 8.0866917465 Simplifying t = 8.0866917465

Subproblem 2

t + -0.5102040815 = -7.576487665 Simplifying t + -0.5102040815 = -7.576487665 Reorder the terms: -0.5102040815 + t = -7.576487665 Solving -0.5102040815 + t = -7.576487665 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5102040815' to each side of the equation. -0.5102040815 + 0.5102040815 + t = -7.576487665 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = -7.576487665 + 0.5102040815 t = -7.576487665 + 0.5102040815 Combine like terms: -7.576487665 + 0.5102040815 = -7.0662835835 t = -7.0662835835 Simplifying t = -7.0662835835

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.0866917465, -7.0662835835}

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