r^2-10r-750=0

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Solution for r^2-10r-750=0 equation:


Simplifying
r2 + -10r + -750 = 0

Reorder the terms:
-750 + -10r + r2 = 0

Solving
-750 + -10r + r2 = 0

Solving for variable 'r'.

Begin completing the square.

Move the constant term to the right:

Add '750' to each side of the equation.
-750 + -10r + 750 + r2 = 0 + 750

Reorder the terms:
-750 + 750 + -10r + r2 = 0 + 750

Combine like terms: -750 + 750 = 0
0 + -10r + r2 = 0 + 750
-10r + r2 = 0 + 750

Combine like terms: 0 + 750 = 750
-10r + r2 = 750

The r term is -10r.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10r + 25 + r2 = 750 + 25

Reorder the terms:
25 + -10r + r2 = 750 + 25

Combine like terms: 750 + 25 = 775
25 + -10r + r2 = 775

Factor a perfect square on the left side:
(r + -5)(r + -5) = 775

Calculate the square root of the right side: 27.838821814

Break this problem into two subproblems by setting 
(r + -5) equal to 27.838821814 and -27.838821814.

Subproblem 1

r + -5 = 27.838821814 Simplifying r + -5 = 27.838821814 Reorder the terms: -5 + r = 27.838821814 Solving -5 + r = 27.838821814 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + r = 27.838821814 + 5 Combine like terms: -5 + 5 = 0 0 + r = 27.838821814 + 5 r = 27.838821814 + 5 Combine like terms: 27.838821814 + 5 = 32.838821814 r = 32.838821814 Simplifying r = 32.838821814

Subproblem 2

r + -5 = -27.838821814 Simplifying r + -5 = -27.838821814 Reorder the terms: -5 + r = -27.838821814 Solving -5 + r = -27.838821814 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + r = -27.838821814 + 5 Combine like terms: -5 + 5 = 0 0 + r = -27.838821814 + 5 r = -27.838821814 + 5 Combine like terms: -27.838821814 + 5 = -22.838821814 r = -22.838821814 Simplifying r = -22.838821814

Solution

The solution to the problem is based on the solutions from the subproblems. r = {32.838821814, -22.838821814}

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