4.9t^2-10t-80=0

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Solution for 4.9t^2-10t-80=0 equation:


Simplifying
4.9t2 + -10t + -80 = 0

Reorder the terms:
-80 + -10t + 4.9t2 = 0

Solving
-80 + -10t + 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'.
-16.32653061 + -2.040816327t + t2 = 0

Move the constant term to the right:

Add '16.32653061' to each side of the equation.
-16.32653061 + -2.040816327t + 16.32653061 + t2 = 0 + 16.32653061

Reorder the terms:
-16.32653061 + 16.32653061 + -2.040816327t + t2 = 0 + 16.32653061

Combine like terms: -16.32653061 + 16.32653061 = 0.00000000
0.00000000 + -2.040816327t + t2 = 0 + 16.32653061
-2.040816327t + t2 = 0 + 16.32653061

Combine like terms: 0 + 16.32653061 = 16.32653061
-2.040816327t + t2 = 16.32653061

The t term is -2.040816327t.  Take half its coefficient (-1.020408164).
Square it (1.041232821) and add it to both sides.

Add '1.041232821' to each side of the equation.
-2.040816327t + 1.041232821 + t2 = 16.32653061 + 1.041232821

Reorder the terms:
1.041232821 + -2.040816327t + t2 = 16.32653061 + 1.041232821

Combine like terms: 16.32653061 + 1.041232821 = 17.367763431
1.041232821 + -2.040816327t + t2 = 17.367763431

Factor a perfect square on the left side:
(t + -1.020408164)(t + -1.020408164) = 17.367763431

Calculate the square root of the right side: 4.167464869

Break this problem into two subproblems by setting 
(t + -1.020408164) equal to 4.167464869 and -4.167464869.

Subproblem 1

t + -1.020408164 = 4.167464869 Simplifying t + -1.020408164 = 4.167464869 Reorder the terms: -1.020408164 + t = 4.167464869 Solving -1.020408164 + t = 4.167464869 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.020408164' to each side of the equation. -1.020408164 + 1.020408164 + t = 4.167464869 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + t = 4.167464869 + 1.020408164 t = 4.167464869 + 1.020408164 Combine like terms: 4.167464869 + 1.020408164 = 5.187873033 t = 5.187873033 Simplifying t = 5.187873033

Subproblem 2

t + -1.020408164 = -4.167464869 Simplifying t + -1.020408164 = -4.167464869 Reorder the terms: -1.020408164 + t = -4.167464869 Solving -1.020408164 + t = -4.167464869 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.020408164' to each side of the equation. -1.020408164 + 1.020408164 + t = -4.167464869 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + t = -4.167464869 + 1.020408164 t = -4.167464869 + 1.020408164 Combine like terms: -4.167464869 + 1.020408164 = -3.147056705 t = -3.147056705 Simplifying t = -3.147056705

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.187873033, -3.147056705}

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