R*1.6(R+10)*1.6=176

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Solution for R*1.6(R+10)*1.6=176 equation:


Simplifying
R * 1.6(R + 10) * 1.6 = 176

Reorder the terms:
R * 1.6(10 + R) * 1.6 = 176

Reorder the terms for easier multiplication:
1.6 * 1.6R(10 + R) = 176

Multiply 1.6 * 1.6
2.56R(10 + R) = 176
(10 * 2.56R + R * 2.56R) = 176
(25.6R + 2.56R2) = 176

Solving
25.6R + 2.56R2 = 176

Solving for variable 'R'.

Reorder the terms:
-176 + 25.6R + 2.56R2 = 176 + -176

Combine like terms: 176 + -176 = 0
-176 + 25.6R + 2.56R2 = 0

Begin completing the square.  Divide all terms by
2.56 the coefficient of the squared term: 

Divide each side by '2.56'.
-68.75 + 10R + R2 = 0

Move the constant term to the right:

Add '68.75' to each side of the equation.
-68.75 + 10R + 68.75 + R2 = 0 + 68.75

Reorder the terms:
-68.75 + 68.75 + 10R + R2 = 0 + 68.75

Combine like terms: -68.75 + 68.75 = 0.00
0.00 + 10R + R2 = 0 + 68.75
10R + R2 = 0 + 68.75

Combine like terms: 0 + 68.75 = 68.75
10R + R2 = 68.75

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 = 68.75 + 25

Reorder the terms:
25 + 10R + R2 = 68.75 + 25

Combine like terms: 68.75 + 25 = 93.75
25 + 10R + R2 = 93.75

Factor a perfect square on the left side:
(R + 5)(R + 5) = 93.75

Calculate the square root of the right side: 9.682458366

Break this problem into two subproblems by setting 
(R + 5) equal to 9.682458366 and -9.682458366.

Subproblem 1

R + 5 = 9.682458366 Simplifying R + 5 = 9.682458366 Reorder the terms: 5 + R = 9.682458366 Solving 5 + R = 9.682458366 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 = 9.682458366 + -5 Combine like terms: 5 + -5 = 0 0 + R = 9.682458366 + -5 R = 9.682458366 + -5 Combine like terms: 9.682458366 + -5 = 4.682458366 R = 4.682458366 Simplifying R = 4.682458366

Subproblem 2

R + 5 = -9.682458366 Simplifying R + 5 = -9.682458366 Reorder the terms: 5 + R = -9.682458366 Solving 5 + R = -9.682458366 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 = -9.682458366 + -5 Combine like terms: 5 + -5 = 0 0 + R = -9.682458366 + -5 R = -9.682458366 + -5 Combine like terms: -9.682458366 + -5 = -14.682458366 R = -14.682458366 Simplifying R = -14.682458366

Solution

The solution to the problem is based on the solutions from the subproblems. R = {4.682458366, -14.682458366}

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