SOLUTION: (21+r)^2

Question 624190: (21+r)^2
Answer by lenny460(1073) (Show Source): You can put this solution on YOUR website!
(21 + r)^2
(21 + r)(21 + r)
21 * 21 = 441
21 * r = 21r
r * 21 = 21r
r * r = r^2

441 + 21r + 21 r + r^2

Combine like terms:
21r + 21r = 42r

The Answer:

441 + 42r + r^2

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