0=74+11.4t-4.9t^2

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Solution for 0=74+11.4t-4.9t^2 equation:


Simplifying
0 = 74 + 11.4t + -4.9t2

Solving
0 = 74 + 11.4t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -74 = -74
-74 + -11.4t + 4.9t2 = 74 + 11.4t + -4.9t2 + -74 + -11.4t + 4.9t2

Reorder the terms:
-74 + -11.4t + 4.9t2 = 74 + -74 + 11.4t + -11.4t + -4.9t2 + 4.9t2

Combine like terms: 74 + -74 = 0
-74 + -11.4t + 4.9t2 = 0 + 11.4t + -11.4t + -4.9t2 + 4.9t2
-74 + -11.4t + 4.9t2 = 11.4t + -11.4t + -4.9t2 + 4.9t2

Combine like terms: 11.4t + -11.4t = 0.0
-74 + -11.4t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
-74 + -11.4t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-74 + -11.4t + 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'.
-15.10204082 + -2.326530612t + t2 = 0

Move the constant term to the right:

Add '15.10204082' to each side of the equation.
-15.10204082 + -2.326530612t + 15.10204082 + t2 = 0 + 15.10204082

Reorder the terms:
-15.10204082 + 15.10204082 + -2.326530612t + t2 = 0 + 15.10204082

Combine like terms: -15.10204082 + 15.10204082 = 0.00000000
0.00000000 + -2.326530612t + t2 = 0 + 15.10204082
-2.326530612t + t2 = 0 + 15.10204082

Combine like terms: 0 + 15.10204082 = 15.10204082
-2.326530612t + t2 = 15.10204082

The t term is -2.326530612t.  Take half its coefficient (-1.163265306).
Square it (1.353186172) and add it to both sides.

Add '1.353186172' to each side of the equation.
-2.326530612t + 1.353186172 + t2 = 15.10204082 + 1.353186172

Reorder the terms:
1.353186172 + -2.326530612t + t2 = 15.10204082 + 1.353186172

Combine like terms: 15.10204082 + 1.353186172 = 16.455226992
1.353186172 + -2.326530612t + t2 = 16.455226992

Factor a perfect square on the left side:
(t + -1.163265306)(t + -1.163265306) = 16.455226992

Calculate the square root of the right side: 4.056504282

Break this problem into two subproblems by setting 
(t + -1.163265306) equal to 4.056504282 and -4.056504282.

Subproblem 1

t + -1.163265306 = 4.056504282 Simplifying t + -1.163265306 = 4.056504282 Reorder the terms: -1.163265306 + t = 4.056504282 Solving -1.163265306 + t = 4.056504282 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.163265306' to each side of the equation. -1.163265306 + 1.163265306 + t = 4.056504282 + 1.163265306 Combine like terms: -1.163265306 + 1.163265306 = 0.000000000 0.000000000 + t = 4.056504282 + 1.163265306 t = 4.056504282 + 1.163265306 Combine like terms: 4.056504282 + 1.163265306 = 5.219769588 t = 5.219769588 Simplifying t = 5.219769588

Subproblem 2

t + -1.163265306 = -4.056504282 Simplifying t + -1.163265306 = -4.056504282 Reorder the terms: -1.163265306 + t = -4.056504282 Solving -1.163265306 + t = -4.056504282 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.163265306' to each side of the equation. -1.163265306 + 1.163265306 + t = -4.056504282 + 1.163265306 Combine like terms: -1.163265306 + 1.163265306 = 0.000000000 0.000000000 + t = -4.056504282 + 1.163265306 t = -4.056504282 + 1.163265306 Combine like terms: -4.056504282 + 1.163265306 = -2.893238976 t = -2.893238976 Simplifying t = -2.893238976

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.219769588, -2.893238976}

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