Q3 of 84 Page 4

If a+b=10 and ab=21, find the value of a3+b3.

Given (a+b)=10 and ab = 21

Using, (a+b)3 = a3 + b3 + 3ab(a+b), we get,



More from this chapter

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1

Find the cube of each of the following binomial expressions:

(i)


(ii)


(iii)


(iv)

2

Simplify each of the following :

(i) (x+3)3 + (x-3)3


(ii)


(iii)


(iv) (2x-5y)3 - (2x+5y)3

 4

If a-b=4 and ab=21, find the value of a3-b3.

 5

If x+=5, find the value of x3+.