2.5=18t+4.9t^2

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Solution for 2.5=18t+4.9t^2 equation:


Simplifying
2.5 = 18t + 4.9t2

Solving
2.5 = 18t + 4.9t2

Solving for variable 't'.

Reorder the terms:
2.5 + -18t + -4.9t2 = 18t + -18t + 4.9t2 + -4.9t2

Combine like terms: 18t + -18t = 0
2.5 + -18t + -4.9t2 = 0 + 4.9t2 + -4.9t2
2.5 + -18t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
2.5 + -18t + -4.9t2 = 0.0

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

Divide each side by '-4.9'.
-0.5102040816 + 3.673469388t + t2 = 0

Move the constant term to the right:

Add '0.5102040816' to each side of the equation.
-0.5102040816 + 3.673469388t + 0.5102040816 + t2 = 0 + 0.5102040816

Reorder the terms:
-0.5102040816 + 0.5102040816 + 3.673469388t + t2 = 0 + 0.5102040816

Combine like terms: -0.5102040816 + 0.5102040816 = 0.0000000000
0.0000000000 + 3.673469388t + t2 = 0 + 0.5102040816
3.673469388t + t2 = 0 + 0.5102040816

Combine like terms: 0 + 0.5102040816 = 0.5102040816
3.673469388t + t2 = 0.5102040816

The t term is 3.673469388t.  Take half its coefficient (1.836734694).
Square it (3.373594336) and add it to both sides.

Add '3.373594336' to each side of the equation.
3.673469388t + 3.373594336 + t2 = 0.5102040816 + 3.373594336

Reorder the terms:
3.373594336 + 3.673469388t + t2 = 0.5102040816 + 3.373594336

Combine like terms: 0.5102040816 + 3.373594336 = 3.8837984176
3.373594336 + 3.673469388t + t2 = 3.8837984176

Factor a perfect square on the left side:
(t + 1.836734694)(t + 1.836734694) = 3.8837984176

Calculate the square root of the right side: 1.970735502

Break this problem into two subproblems by setting 
(t + 1.836734694) equal to 1.970735502 and -1.970735502.

Subproblem 1

t + 1.836734694 = 1.970735502 Simplifying t + 1.836734694 = 1.970735502 Reorder the terms: 1.836734694 + t = 1.970735502 Solving 1.836734694 + t = 1.970735502 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.836734694' to each side of the equation. 1.836734694 + -1.836734694 + t = 1.970735502 + -1.836734694 Combine like terms: 1.836734694 + -1.836734694 = 0.000000000 0.000000000 + t = 1.970735502 + -1.836734694 t = 1.970735502 + -1.836734694 Combine like terms: 1.970735502 + -1.836734694 = 0.134000808 t = 0.134000808 Simplifying t = 0.134000808

Subproblem 2

t + 1.836734694 = -1.970735502 Simplifying t + 1.836734694 = -1.970735502 Reorder the terms: 1.836734694 + t = -1.970735502 Solving 1.836734694 + t = -1.970735502 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.836734694' to each side of the equation. 1.836734694 + -1.836734694 + t = -1.970735502 + -1.836734694 Combine like terms: 1.836734694 + -1.836734694 = 0.000000000 0.000000000 + t = -1.970735502 + -1.836734694 t = -1.970735502 + -1.836734694 Combine like terms: -1.970735502 + -1.836734694 = -3.807470196 t = -3.807470196 Simplifying t = -3.807470196

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.134000808, -3.807470196}

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