(r+5)(r-4)
The idea is to get two numbers whose product in this case is -20, and whose sum in this case s +1.
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r2+6r-7 = (r+7)(r-1) when factored
-15
domain = set R ,, all real numbers
(5r - 4)(5r + 4)
your nan minus your mum squared all dived by 2 to the sum of r=20 to r= 1.