35=-3t^2+18t+21

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Solution for 35=-3t^2+18t+21 equation:


Simplifying
35 = -3t2 + 18t + 21

Reorder the terms:
35 = 21 + 18t + -3t2

Solving
35 = 21 + 18t + -3t2

Solving for variable 't'.

Combine like terms: 35 + -21 = 14
14 + -18t + 3t2 = 21 + 18t + -3t2 + -21 + -18t + 3t2

Reorder the terms:
14 + -18t + 3t2 = 21 + -21 + 18t + -18t + -3t2 + 3t2

Combine like terms: 21 + -21 = 0
14 + -18t + 3t2 = 0 + 18t + -18t + -3t2 + 3t2
14 + -18t + 3t2 = 18t + -18t + -3t2 + 3t2

Combine like terms: 18t + -18t = 0
14 + -18t + 3t2 = 0 + -3t2 + 3t2
14 + -18t + 3t2 = -3t2 + 3t2

Combine like terms: -3t2 + 3t2 = 0
14 + -18t + 3t2 = 0

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

Divide each side by '3'.
4.666666667 + -6t + t2 = 0

Move the constant term to the right:

Add '-4.666666667' to each side of the equation.
4.666666667 + -6t + -4.666666667 + t2 = 0 + -4.666666667

Reorder the terms:
4.666666667 + -4.666666667 + -6t + t2 = 0 + -4.666666667

Combine like terms: 4.666666667 + -4.666666667 = 0.000000000
0.000000000 + -6t + t2 = 0 + -4.666666667
-6t + t2 = 0 + -4.666666667

Combine like terms: 0 + -4.666666667 = -4.666666667
-6t + t2 = -4.666666667

The t term is -6t.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6t + 9 + t2 = -4.666666667 + 9

Reorder the terms:
9 + -6t + t2 = -4.666666667 + 9

Combine like terms: -4.666666667 + 9 = 4.333333333
9 + -6t + t2 = 4.333333333

Factor a perfect square on the left side:
(t + -3)(t + -3) = 4.333333333

Calculate the square root of the right side: 2.081665999

Break this problem into two subproblems by setting 
(t + -3) equal to 2.081665999 and -2.081665999.

Subproblem 1

t + -3 = 2.081665999 Simplifying t + -3 = 2.081665999 Reorder the terms: -3 + t = 2.081665999 Solving -3 + t = 2.081665999 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + t = 2.081665999 + 3 Combine like terms: -3 + 3 = 0 0 + t = 2.081665999 + 3 t = 2.081665999 + 3 Combine like terms: 2.081665999 + 3 = 5.081665999 t = 5.081665999 Simplifying t = 5.081665999

Subproblem 2

t + -3 = -2.081665999 Simplifying t + -3 = -2.081665999 Reorder the terms: -3 + t = -2.081665999 Solving -3 + t = -2.081665999 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + t = -2.081665999 + 3 Combine like terms: -3 + 3 = 0 0 + t = -2.081665999 + 3 t = -2.081665999 + 3 Combine like terms: -2.081665999 + 3 = 0.918334001 t = 0.918334001 Simplifying t = 0.918334001

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.081665999, 0.918334001}

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