t^2+5t=20

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Solution for t^2+5t=20 equation:


Simplifying
t2 + 5t = 20

Reorder the terms:
5t + t2 = 20

Solving
5t + t2 = 20

Solving for variable 't'.

Reorder the terms:
-20 + 5t + t2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + 5t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 5t + 20 + t2 = 0 + 20

Reorder the terms:
-20 + 20 + 5t + t2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 5t + t2 = 0 + 20
5t + t2 = 0 + 20

Combine like terms: 0 + 20 = 20
5t + t2 = 20

The t term is 5t.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5t + 6.25 + t2 = 20 + 6.25

Reorder the terms:
6.25 + 5t + t2 = 20 + 6.25

Combine like terms: 20 + 6.25 = 26.25
6.25 + 5t + t2 = 26.25

Factor a perfect square on the left side:
(t + 2.5)(t + 2.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(t + 2.5) equal to 5.123475383 and -5.123475383.

Subproblem 1

t + 2.5 = 5.123475383 Simplifying t + 2.5 = 5.123475383 Reorder the terms: 2.5 + t = 5.123475383 Solving 2.5 + t = 5.123475383 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + t = 5.123475383 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + t = 5.123475383 + -2.5 t = 5.123475383 + -2.5 Combine like terms: 5.123475383 + -2.5 = 2.623475383 t = 2.623475383 Simplifying t = 2.623475383

Subproblem 2

t + 2.5 = -5.123475383 Simplifying t + 2.5 = -5.123475383 Reorder the terms: 2.5 + t = -5.123475383 Solving 2.5 + t = -5.123475383 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + t = -5.123475383 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + t = -5.123475383 + -2.5 t = -5.123475383 + -2.5 Combine like terms: -5.123475383 + -2.5 = -7.623475383 t = -7.623475383 Simplifying t = -7.623475383

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.623475383, -7.623475383}

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