question 4
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substitute x = 0
P(0) = 0 - 4*0 = 0
substitute x = 4
P(4) = 4^2 - 4*4
P(4) = 16 - 16 = 0
Hope it helped you
Ans 5:
P(x) = x^2 - 2x
= x(x-2) = 0
= x = 0 , 2