Question

(1-2x+2x²)²=a0+a1x+a2x²+a3x³+a4x4. then sum of the coefficient a1+a2+a3+a4 is :
a)0
b)1
c)73
d)18
the answer is 0 pls explain it​

Answer 1

Answer:

We have,

(1+x+2x2)20=a0+a1x+a2x2+a3x3+.........+a40x40

Let, put qx=1 and we get,

(1+1+2(1)2)20=a0+a1+a2+a3+........+a40

420=a0+a1+a2+a3+........+a40......(1)

Again, put

x=−1 and we get,

(1−1+2(1)2)20=a

Answer 2

Answer:

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