Question

57
PFACTOR
6. If a+b+c= 9 and ab + bc + ca = 26, then find a + b + c?.
7. Evaluate the following using suitable identites.
1 (99)
(i) (102)
(ii) (998)
(iv) (1001)
8. Factorise each of
the following
80+ b3 + 1207b + 6ab2
(i) 8a - 63 - 12a+b + 6ab
1
12
p+ p
25
125
1 - 640 - 12a + 48a? (iv) 8p
9. Verify (1) x + y2 = (x + y) (r? - xy + y2) (ii) x - y = (x - y) (x2 + xy + y)
using some non-zero positive integers and check by actual multiplication. Can you call
these as identites?
10. Factorise (1) 27 +6463 () 343y - 1000 using the above results.
11. Factorise 27x? + y2 + 2? - 9xyz using identity.​

Answer 1

a +b+c is equal to 9 okkkkkk