Question

1.If x+y+z=0, then x3+y3+z3 is
a) 3xyz
b) −3xyz
c) xyz
2.The value of (80)2−(20)2 is
a) 10
b) 100
c) 6000
d) 60
3.The coefficient of ′x′ in the expansion of (x−4)3 is
• 1
• −12
• 48
• −64

Answer 1

Answer:

1.a)3xyz

2.(80)^2-(20)^2

=>(80+20)(80-20)

=>100×60

=>6000

answer is c

3.Try it yourself

Answer 2

1. A.
2. C.
3. -48

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