(18)(18)+(r)(r)=(r+6)(r+6)

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Solution for (18)(18)+(r)(r)=(r+6)(r+6) equation:


Simplifying
(18)(18) + (r)(r) = (r + 6)(r + 6)

Multiply 18 * 18
324 + (r)(r) = (r + 6)(r + 6)

Multiply r * r
324 + r2 = (r + 6)(r + 6)

Reorder the terms:
324 + r2 = (6 + r)(r + 6)

Reorder the terms:
324 + r2 = (6 + r)(6 + r)

Multiply (6 + r) * (6 + r)
324 + r2 = (6(6 + r) + r(6 + r))
324 + r2 = ((6 * 6 + r * 6) + r(6 + r))
324 + r2 = ((36 + 6r) + r(6 + r))
324 + r2 = (36 + 6r + (6 * r + r * r))
324 + r2 = (36 + 6r + (6r + r2))

Combine like terms: 6r + 6r = 12r
324 + r2 = (36 + 12r + r2)

Add '-1r2' to each side of the equation.
324 + r2 + -1r2 = 36 + 12r + r2 + -1r2

Combine like terms: r2 + -1r2 = 0
324 + 0 = 36 + 12r + r2 + -1r2
324 = 36 + 12r + r2 + -1r2

Combine like terms: r2 + -1r2 = 0
324 = 36 + 12r + 0
324 = 36 + 12r

Solving
324 = 36 + 12r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-12r' to each side of the equation.
324 + -12r = 36 + 12r + -12r

Combine like terms: 12r + -12r = 0
324 + -12r = 36 + 0
324 + -12r = 36

Add '-324' to each side of the equation.
324 + -324 + -12r = 36 + -324

Combine like terms: 324 + -324 = 0
0 + -12r = 36 + -324
-12r = 36 + -324

Combine like terms: 36 + -324 = -288
-12r = -288

Divide each side by '-12'.
r = 24

Simplifying
r = 24

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