25=4t+5t^2

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Solution for 25=4t+5t^2 equation:


Simplifying
25 = 4t + 5t2

Solving
25 = 4t + 5t2

Solving for variable 't'.

Reorder the terms:
25 + -4t + -5t2 = 4t + -4t + 5t2 + -5t2

Combine like terms: 4t + -4t = 0
25 + -4t + -5t2 = 0 + 5t2 + -5t2
25 + -4t + -5t2 = 5t2 + -5t2

Combine like terms: 5t2 + -5t2 = 0
25 + -4t + -5t2 = 0

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

Divide each side by '-5'.
-5 + 0.8t + t2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 0.8t + 5 + t2 = 0 + 5

Reorder the terms:
-5 + 5 + 0.8t + t2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 0.8t + t2 = 0 + 5
0.8t + t2 = 0 + 5

Combine like terms: 0 + 5 = 5
0.8t + t2 = 5

The t term is 0.8t.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8t + 0.16 + t2 = 5 + 0.16

Reorder the terms:
0.16 + 0.8t + t2 = 5 + 0.16

Combine like terms: 5 + 0.16 = 5.16
0.16 + 0.8t + t2 = 5.16

Factor a perfect square on the left side:
(t + 0.4)(t + 0.4) = 5.16

Calculate the square root of the right side: 2.271563338

Break this problem into two subproblems by setting 
(t + 0.4) equal to 2.271563338 and -2.271563338.

Subproblem 1

t + 0.4 = 2.271563338 Simplifying t + 0.4 = 2.271563338 Reorder the terms: 0.4 + t = 2.271563338 Solving 0.4 + t = 2.271563338 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + t = 2.271563338 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + t = 2.271563338 + -0.4 t = 2.271563338 + -0.4 Combine like terms: 2.271563338 + -0.4 = 1.871563338 t = 1.871563338 Simplifying t = 1.871563338

Subproblem 2

t + 0.4 = -2.271563338 Simplifying t + 0.4 = -2.271563338 Reorder the terms: 0.4 + t = -2.271563338 Solving 0.4 + t = -2.271563338 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + t = -2.271563338 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + t = -2.271563338 + -0.4 t = -2.271563338 + -0.4 Combine like terms: -2.271563338 + -0.4 = -2.671563338 t = -2.671563338 Simplifying t = -2.671563338

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.871563338, -2.671563338}

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