0=(-t^2)+7t+10

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Solution for 0=(-t^2)+7t+10 equation:


Simplifying
0 = (-1t2) + 7t + 10

Reorder the terms:
0 = 10 + 7t + (-1t2)

Solving
0 = 10 + 7t + (-1t2)

Solving for variable 't'.
0 + -10 + -7t + t2 = 10 + 7t + (-1t2) + -10 + -7t + (t2)

Combine like terms: 0 + -10 = -10
-10 + -7t + t2 = 10 + 7t + (-1t2) + -10 + -7t + (t2)
-10 + -7t + t2 = 10 + 7t + (-1t2) + -10 + -7t + t2

Reorder the terms:
-10 + -7t + t2 = 10 + -10 + 7t + -7t + (-1t2) + t2

Combine like terms: 10 + -10 = 0
-10 + -7t + t2 = 0 + 7t + -7t + (-1t2) + t2
-10 + -7t + t2 = 7t + -7t + (-1t2) + t2

Combine like terms: 7t + -7t = 0
-10 + -7t + t2 = 0 + (-1t2) + t2
-10 + -7t + t2 = (-1t2) + t2

Combine like terms: (-1t2) + t2 = 0
-10 + -7t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -7t + 10 + t2 = 0 + 10

Reorder the terms:
-10 + 10 + -7t + t2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -7t + t2 = 0 + 10
-7t + t2 = 0 + 10

Combine like terms: 0 + 10 = 10
-7t + t2 = 10

The t term is -7t.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7t + 12.25 + t2 = 10 + 12.25

Reorder the terms:
12.25 + -7t + t2 = 10 + 12.25

Combine like terms: 10 + 12.25 = 22.25
12.25 + -7t + t2 = 22.25

Factor a perfect square on the left side:
(t + -3.5)(t + -3.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(t + -3.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

t + -3.5 = 4.716990566 Simplifying t + -3.5 = 4.716990566 Reorder the terms: -3.5 + t = 4.716990566 Solving -3.5 + t = 4.716990566 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + t = 4.716990566 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + t = 4.716990566 + 3.5 t = 4.716990566 + 3.5 Combine like terms: 4.716990566 + 3.5 = 8.216990566 t = 8.216990566 Simplifying t = 8.216990566

Subproblem 2

t + -3.5 = -4.716990566 Simplifying t + -3.5 = -4.716990566 Reorder the terms: -3.5 + t = -4.716990566 Solving -3.5 + t = -4.716990566 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + t = -4.716990566 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + t = -4.716990566 + 3.5 t = -4.716990566 + 3.5 Combine like terms: -4.716990566 + 3.5 = -1.216990566 t = -1.216990566 Simplifying t = -1.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.216990566, -1.216990566}

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