4.9t^2+10t-65=0

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Solution for 4.9t^2+10t-65=0 equation:


Simplifying
4.9t2 + 10t + -65 = 0

Reorder the terms:
-65 + 10t + 4.9t2 = 0

Solving
-65 + 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'.
-13.26530612 + 2.040816327t + t2 = 0

Move the constant term to the right:

Add '13.26530612' to each side of the equation.
-13.26530612 + 2.040816327t + 13.26530612 + t2 = 0 + 13.26530612

Reorder the terms:
-13.26530612 + 13.26530612 + 2.040816327t + t2 = 0 + 13.26530612

Combine like terms: -13.26530612 + 13.26530612 = 0.00000000
0.00000000 + 2.040816327t + t2 = 0 + 13.26530612
2.040816327t + t2 = 0 + 13.26530612

Combine like terms: 0 + 13.26530612 = 13.26530612
2.040816327t + t2 = 13.26530612

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 = 13.26530612 + 1.041232821

Reorder the terms:
1.041232821 + 2.040816327t + t2 = 13.26530612 + 1.041232821

Combine like terms: 13.26530612 + 1.041232821 = 14.306538941
1.041232821 + 2.040816327t + t2 = 14.306538941

Factor a perfect square on the left side:
(t + 1.020408164)(t + 1.020408164) = 14.306538941

Calculate the square root of the right side: 3.78239857

Break this problem into two subproblems by setting 
(t + 1.020408164) equal to 3.78239857 and -3.78239857.

Subproblem 1

t + 1.020408164 = 3.78239857 Simplifying t + 1.020408164 = 3.78239857 Reorder the terms: 1.020408164 + t = 3.78239857 Solving 1.020408164 + t = 3.78239857 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 = 3.78239857 + -1.020408164 Combine like terms: 1.020408164 + -1.020408164 = 0.000000000 0.000000000 + t = 3.78239857 + -1.020408164 t = 3.78239857 + -1.020408164 Combine like terms: 3.78239857 + -1.020408164 = 2.761990406 t = 2.761990406 Simplifying t = 2.761990406

Subproblem 2

t + 1.020408164 = -3.78239857 Simplifying t + 1.020408164 = -3.78239857 Reorder the terms: 1.020408164 + t = -3.78239857 Solving 1.020408164 + t = -3.78239857 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 = -3.78239857 + -1.020408164 Combine like terms: 1.020408164 + -1.020408164 = 0.000000000 0.000000000 + t = -3.78239857 + -1.020408164 t = -3.78239857 + -1.020408164 Combine like terms: -3.78239857 + -1.020408164 = -4.802806734 t = -4.802806734 Simplifying t = -4.802806734

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.761990406, -4.802806734}

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