Question

Ull the sum of 3a?
Q8. It x = 1, y = 2 and z= 5, find the value of
(i) 3x – 2y + 4z
(ii) x²+ y² + z²
iii 2x² y-3y² + z²​

Answer 1

Answer :

GiveN :

• x = 1
• y = 2
• z = 5

FinD :

( i ) 3x - 2y + 4z

( ii ) x²+ y² + z²

( iii ) 2x² y - 3y² + z²

SolutioN :

( i ) 3x - 2y + 4z

= 3 × 1 - 2 × 2 + 4 × 5

= 3 - 4 + 20

= 23 - 4

= 19

( ii ) x²+ y² + z²

= ( 1 )² + ( 2 )² + ( 5 )²

= 1 + 4 + 25

= 26 + 4

= 30

( iii ) 2x² y - 3y² + z²

= 2( 1 )²2 - 3( 2 )² + ( 5 )²

= 4 - 12 + 25

= 29 - 12

= 17