# If p(x)=x⁴+ax³+bx²+cx+d and p(1)=p(2),p(3)=0 then find the value of p(4)+p(0)

2
by rashmideshpand

2014-10-17T16:18:10+05:30

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P(1) = a + b + c + d + 1 = p(2) = 16 + 8a + 4b + 2 c + d

7 a + 3 b +  c + 15  = 0     --  eq 1
c  = - 7 a - 3b - 15    -- eq 4

p(3) = 81 + 27 a + 9 b + 3c +d = 0
27 a + 9 b + 3 c + d = - 81       -- eq 2

4 * eq 1 - equ 2 gives    a + 3b + c - 21 = d        -- eq 3   substitute value of c.
d = a + 3b -7a - 3b - 15 - 21  = - 6 a - 36   -- eq 5

p(4)+p(0) = (256 + 64 a + 16 b + 4 c + d) + ( d)
= 64 a + 16 b + 4 c + 2 d + 256

substituting values of c and d,
= 24 a + 4b + 124

but sir it is given that p(1)=p(2) then how u have taken p(1)=0 and p(2)=0.Please explain
oh! i am sorry - the letters are so close, i mistook , for =
done
2014-10-17T18:38:10+05:30
P(1)= 1^4+a(1)^3+b(1)^2+c(1)+d=a+b+c+d+1
substitute the values of x=2 and 3
equate them. you will get P(4 )+ p(0) = 64a+16b+4c+2d+256
since, you have got the values of c and d, substitute them. you will get the final equation as 24a+4b+124