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CBSE - IX - Mathematics

If x2-1 is a factor of ax3+bx2+cx+d, show that a+c=0

Asked by Vikas 24th March 2017, 6:00 PM
Answered by Expert


Hi Ananya,

Consider the quadratic equation,x2 +4x+4

The degree of the quadratic equation is 2.

However, if you solve this equation and find the roots, you will realise that you will get only 1 root, that is '2'.

This is cause the roots are repeated. 

That is, why we say atmost which means maximum n roots. 

The same holds for an equation with degree n.

We can always have some equations which have equal (that is, repeated) roots.

Hence, we use the word ATMOST.

Answered by Expert 24th March 2017, 8:41 PM

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