Question

7. A factor of x3 – 1 is
(a) x - 1
(b) x + 1
(c) x2 + x + 1 (d) Both (a) & (c)
3. If a + b +c= 10 and a2 + b2 + c2 = 36 then, ab
bc + ca is
(a) 32
(b) 64
(c) 68
(d) 136
If x - y = 4 and xy = 21, then x3 - y3 is
(a) 361
(b) 316​

Answer 1

(7) (x−1) and (x²+x+1)

(3) 32

(4) 316

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