30=14t+5t^2

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Solution for 30=14t+5t^2 equation:


Simplifying
30 = 14t + 5t2

Solving
30 = 14t + 5t2

Solving for variable 't'.

Reorder the terms:
30 + -14t + -5t2 = 14t + -14t + 5t2 + -5t2

Combine like terms: 14t + -14t = 0
30 + -14t + -5t2 = 0 + 5t2 + -5t2
30 + -14t + -5t2 = 5t2 + -5t2

Combine like terms: 5t2 + -5t2 = 0
30 + -14t + -5t2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-6 + 2.8t + t2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 2.8t + 6 + t2 = 0 + 6

Reorder the terms:
-6 + 6 + 2.8t + t2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 2.8t + t2 = 0 + 6
2.8t + t2 = 0 + 6

Combine like terms: 0 + 6 = 6
2.8t + t2 = 6

The t term is 2.8t.  Take half its coefficient (1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
2.8t + 1.96 + t2 = 6 + 1.96

Reorder the terms:
1.96 + 2.8t + t2 = 6 + 1.96

Combine like terms: 6 + 1.96 = 7.96
1.96 + 2.8t + t2 = 7.96

Factor a perfect square on the left side:
(t + 1.4)(t + 1.4) = 7.96

Calculate the square root of the right side: 2.821347196

Break this problem into two subproblems by setting 
(t + 1.4) equal to 2.821347196 and -2.821347196.

Subproblem 1

t + 1.4 = 2.821347196 Simplifying t + 1.4 = 2.821347196 Reorder the terms: 1.4 + t = 2.821347196 Solving 1.4 + t = 2.821347196 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + t = 2.821347196 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + t = 2.821347196 + -1.4 t = 2.821347196 + -1.4 Combine like terms: 2.821347196 + -1.4 = 1.421347196 t = 1.421347196 Simplifying t = 1.421347196

Subproblem 2

t + 1.4 = -2.821347196 Simplifying t + 1.4 = -2.821347196 Reorder the terms: 1.4 + t = -2.821347196 Solving 1.4 + t = -2.821347196 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + t = -2.821347196 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + t = -2.821347196 + -1.4 t = -2.821347196 + -1.4 Combine like terms: -2.821347196 + -1.4 = -4.221347196 t = -4.221347196 Simplifying t = -4.221347196

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.421347196, -4.221347196}

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