f^2-10f=19

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Solution for f^2-10f=19 equation:


Simplifying
f2 + -10f = 19

Reorder the terms:
-10f + f2 = 19

Solving
-10f + f2 = 19

Solving for variable 'f'.

Reorder the terms:
-19 + -10f + f2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + -10f + f2 = 0

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -10f + 19 + f2 = 0 + 19

Reorder the terms:
-19 + 19 + -10f + f2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -10f + f2 = 0 + 19
-10f + f2 = 0 + 19

Combine like terms: 0 + 19 = 19
-10f + f2 = 19

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

Add '25' to each side of the equation.
-10f + 25 + f2 = 19 + 25

Reorder the terms:
25 + -10f + f2 = 19 + 25

Combine like terms: 19 + 25 = 44
25 + -10f + f2 = 44

Factor a perfect square on the left side:
(f + -5)(f + -5) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(f + -5) equal to 6.633249581 and -6.633249581.

Subproblem 1

f + -5 = 6.633249581 Simplifying f + -5 = 6.633249581 Reorder the terms: -5 + f = 6.633249581 Solving -5 + f = 6.633249581 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + f = 6.633249581 + 5 Combine like terms: -5 + 5 = 0 0 + f = 6.633249581 + 5 f = 6.633249581 + 5 Combine like terms: 6.633249581 + 5 = 11.633249581 f = 11.633249581 Simplifying f = 11.633249581

Subproblem 2

f + -5 = -6.633249581 Simplifying f + -5 = -6.633249581 Reorder the terms: -5 + f = -6.633249581 Solving -5 + f = -6.633249581 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + f = -6.633249581 + 5 Combine like terms: -5 + 5 = 0 0 + f = -6.633249581 + 5 f = -6.633249581 + 5 Combine like terms: -6.633249581 + 5 = -1.633249581 f = -1.633249581 Simplifying f = -1.633249581

Solution

The solution to the problem is based on the solutions from the subproblems. f = {11.633249581, -1.633249581}

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