Factor r^2+10r+21

Math
r2+10r+21
Consider the form x2+bx+c. Find a pair of integers whose product is c and whose sum is b. In this case, whose product is 21 and whose sum is 10.
3,7
Write the factored form using these integers.
(r+3)(r+7)
Factor r^2+10r+21

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