Question

If x = 4, y = 3 and z = -2, find the value of :
(i) x2 + y2 + z2 + 2xyz​

Answer 1

Finding value of an expression

Given: x = 4, y = 3 and z = - 2

To find: the value of the expression x² + y² + z² + 2xyz

Solution:

• To find such values of any expression when values of the variables are given, simply substitute the values in the expression.

• Thus, x² + y² + z² + 2xyz
• = 4² + 3² + (- 2)² + 2 ×4 × 3 × (- 2)
• = 16 + 9 + 4 - 48
• = 29 - 48
• = - 19

Answer: x² + y² + z² - 2xyz = - 19.

Answer 2

Answer:

18

Step-by-step explanation:

The answer is 18 because
X=4+2=6
y=3+2=5
z=-2+2=0
2+x=4+y=3+-2=7

6+5+0+7
=18
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