Question

Please tell me the Q20 and Q21 (D)

Answer 1

Answer:

Step-by-step explanation:

Q 20

x³+y³+z³

1³+3³+(-1)³

1+27-1

27

Q 21

5x²+3y²-6z²x

5(1)²+3(3)²-6(-1)²1

(5x1)+(3x9)-(6x1)

5+27-6

26

Answer 2

as per equation give x=1,y=3,z=-1
20th ans by putting values
=1^3+3^3+(-1)^3
=1+27-1
=27
and
21)
=5(1)^2+3(3)^3-6(-1)^2(1)
=5+27-6
=32-6
=26