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How do i find the excluded value of this denominator?
r^3−r^2−49r+49
 2 years ago
 2 years ago
How do i find the excluded value of this denominator? r^3−r^2−49r+49
 2 years ago
 2 years ago

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Kira_YamatoBest ResponseYou've already chosen the best response.2
Let the denominator = 0
 2 years ago

neverforgetvivisteeBest ResponseYou've already chosen the best response.0
i learned that we factor it first and equal it to zero
 2 years ago

neverforgetvivisteeBest ResponseYou've already chosen the best response.0
how do i solve it? it doesn't have a common factor
 2 years ago

cwrw238Best ResponseYou've already chosen the best response.0
try finding a factor using factor theorem
 2 years ago

neverforgetvivisteeBest ResponseYou've already chosen the best response.0
thanks i'll learn that go learn that i haven't learned that yet
 2 years ago

cwrw238Best ResponseYou've already chosen the best response.0
x7 is worth trying (as last term = 7^) f(7) = 343  49  343 + 49 = 0 ok so (x7) is a factor now find any other factors by dividing by x7
 2 years ago

cwrw238Best ResponseYou've already chosen the best response.0
factor theorem if f(x) is divisible by xa then f(a) = 0
 2 years ago

cwrw238Best ResponseYou've already chosen the best response.0
r^2 +6r  7  r7 ) r^3−r^2 −49r+49 r^3 7r^2  6r^2  49r 6r^2  42r  7r + 49
 2 years ago

cwrw238Best ResponseYou've already chosen the best response.0
r^2 +6r  7 = (r+7)(r1) so factors of f(r) = (r7)(r+7)(r1)
 2 years ago

cwrw238Best ResponseYou've already chosen the best response.0
so excluded value is value of f(r) when r=7,7 or 1
 2 years ago
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