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Let the denominator = 0

how?

Solve the eqn = 0

i learned that we factor it first and equal it to zero

how do i solve it? it doesn't have a common factor

try finding a factor using factor theorem

thanks i'll learn that go learn that
i haven't learned that yet

factor theorem if f(x) is divisible by x-a then f(a) = 0

r^2 +6r - 7 = (r+7)(r-1)
so factors of f(r) =
(r-7)(r+7)(r-1)

so excluded value is value of f(r) when r=7,-7 or 1

Yes