1.

x4 + xy3 + x3y + xz3 + y4 + yz3 is divisible by :(a) (x – y) only (b) (x3 + y3 + z3) only (c) both (x + y) and (x3 + y3 + z3) (d) None of the above

Answer»

(b) (x3 + y3 + z3) only

Hint. x4 + xy3 + x3y + xz3 + y4 + yz3 

= (x4 + xy3 + xz3) + (x3y + y4 + yz3

= x(x3 + y3 + z3) + y(x3 + y3 + z3

= (x + y) (x3 + y3 + z3)



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