Q1 of 82 Page 130

Let us calculate and write, which of the following polynomials will have a factor (x + 1)?

7x3 + x2 + 7x + 1

Formula used.


If f(x) is a polynomial with degree n


Then (x – a) is a factor of f(x) if f(a) = 0


1st we find out zero of polynomial x + 1


x + 1 = 0


x = – 1


if f(x) is 7x3 + x2 + 7x + 1


then putting x = – 1;


f( – 1) = 7( – 1)3 + ( – 1)2 + 7( – 1) + 1


= 7 × ( – 1) + 1 + 7 × ( – 1) + 1


= – 7 + 1 – 7 + 1


= – 12


Conclusion.


∴ (x + 1) is not a factor of 7x3 + x2 + 7x + 1


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