-4.9t^2+5t=-9

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Solution for -4.9t^2+5t=-9 equation:


Simplifying
-4.9t2 + 5t = -9

Reorder the terms:
5t + -4.9t2 = -9

Solving
5t + -4.9t2 = -9

Solving for variable 't'.

Reorder the terms:
9 + 5t + -4.9t2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + 5t + -4.9t2 = 0

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

Divide each side by '-4.9'.
-1.836734694 + -1.020408163t + t2 = 0

Move the constant term to the right:

Add '1.836734694' to each side of the equation.
-1.836734694 + -1.020408163t + 1.836734694 + t2 = 0 + 1.836734694

Reorder the terms:
-1.836734694 + 1.836734694 + -1.020408163t + t2 = 0 + 1.836734694

Combine like terms: -1.836734694 + 1.836734694 = 0.000000000
0.000000000 + -1.020408163t + t2 = 0 + 1.836734694
-1.020408163t + t2 = 0 + 1.836734694

Combine like terms: 0 + 1.836734694 = 1.836734694
-1.020408163t + t2 = 1.836734694

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 = 1.836734694 + 0.2603082048

Reorder the terms:
0.2603082048 + -1.020408163t + t2 = 1.836734694 + 0.2603082048

Combine like terms: 1.836734694 + 0.2603082048 = 2.0970428988
0.2603082048 + -1.020408163t + t2 = 2.0970428988

Factor a perfect square on the left side:
(t + -0.5102040815)(t + -0.5102040815) = 2.0970428988

Calculate the square root of the right side: 1.448117018

Break this problem into two subproblems by setting 
(t + -0.5102040815) equal to 1.448117018 and -1.448117018.

Subproblem 1

t + -0.5102040815 = 1.448117018 Simplifying t + -0.5102040815 = 1.448117018 Reorder the terms: -0.5102040815 + t = 1.448117018 Solving -0.5102040815 + t = 1.448117018 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 = 1.448117018 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = 1.448117018 + 0.5102040815 t = 1.448117018 + 0.5102040815 Combine like terms: 1.448117018 + 0.5102040815 = 1.9583210995 t = 1.9583210995 Simplifying t = 1.9583210995

Subproblem 2

t + -0.5102040815 = -1.448117018 Simplifying t + -0.5102040815 = -1.448117018 Reorder the terms: -0.5102040815 + t = -1.448117018 Solving -0.5102040815 + t = -1.448117018 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 = -1.448117018 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = -1.448117018 + 0.5102040815 t = -1.448117018 + 0.5102040815 Combine like terms: -1.448117018 + 0.5102040815 = -0.9379129365 t = -0.9379129365 Simplifying t = -0.9379129365

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.9583210995, -0.9379129365}

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