t(t+11)=70

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Solution for t(t+11)=70 equation:


Simplifying
t(t + 11) = 70

Reorder the terms:
t(11 + t) = 70
(11 * t + t * t) = 70
(11t + t2) = 70

Solving
11t + t2 = 70

Solving for variable 't'.

Reorder the terms:
-70 + 11t + t2 = 70 + -70

Combine like terms: 70 + -70 = 0
-70 + 11t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + 11t + 70 + t2 = 0 + 70

Reorder the terms:
-70 + 70 + 11t + t2 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + 11t + t2 = 0 + 70
11t + t2 = 0 + 70

Combine like terms: 0 + 70 = 70
11t + t2 = 70

The t term is 11t.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11t + 30.25 + t2 = 70 + 30.25

Reorder the terms:
30.25 + 11t + t2 = 70 + 30.25

Combine like terms: 70 + 30.25 = 100.25
30.25 + 11t + t2 = 100.25

Factor a perfect square on the left side:
(t + 5.5)(t + 5.5) = 100.25

Calculate the square root of the right side: 10.012492197

Break this problem into two subproblems by setting 
(t + 5.5) equal to 10.012492197 and -10.012492197.

Subproblem 1

t + 5.5 = 10.012492197 Simplifying t + 5.5 = 10.012492197 Reorder the terms: 5.5 + t = 10.012492197 Solving 5.5 + t = 10.012492197 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + t = 10.012492197 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + t = 10.012492197 + -5.5 t = 10.012492197 + -5.5 Combine like terms: 10.012492197 + -5.5 = 4.512492197 t = 4.512492197 Simplifying t = 4.512492197

Subproblem 2

t + 5.5 = -10.012492197 Simplifying t + 5.5 = -10.012492197 Reorder the terms: 5.5 + t = -10.012492197 Solving 5.5 + t = -10.012492197 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + t = -10.012492197 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + t = -10.012492197 + -5.5 t = -10.012492197 + -5.5 Combine like terms: -10.012492197 + -5.5 = -15.512492197 t = -15.512492197 Simplifying t = -15.512492197

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.512492197, -15.512492197}

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