Question

How much is 3x2 – 5x + 7 less than x3 – 5x2 + 7x - 3?​

Answer 1

Answer:

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Answer 2

Answer:

Let S=1+3x+5x2+7x3

Multiplying both sides by a, we get

Sx=0+x+3x2+5x3

Subtract both eqns, we get

S(1−x)=1+2(x+x2+x3

Clearly, the series in the bracket is a gb with common ratio =x

S(1−x)=1+1−x2x=1−x1+x

⇒S=(1−x)21+x

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