At how many points does the cubic polynomial (x+1) (x+3) x intersect with X-axis
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Answer:
f(x)=x3−1
it intersect x-axis if
f (x) = 0
x3−1= 0
(x−1)(x2+x+1)=0
⇒(x−1)=0 or (x2+x+1)=0
⇒x=1 because (x2+x+1)=0 has no real
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