Question

What is value of 3x2+4y2if x=2, y=1, and z=-3

Answer 1

0 if the original expression is : 3x^2 + 4yz

Explanation:

3x^2 + 4yz ; I guess this is the original expression.

When x=2, y = 1 z =-3

3x^2 + 4yz = 3(2)^2 + 4 × (1)×(-3)

= 3×4 + 4 × (-3) = 12 - 12 = 0

Answer 2

16

Explanation:

3x² + 4y² where x = 2, y = 1, and z = -3

Here we just need to plug in the given values to their respective variables

• 3(2)² + 4(1)²
• There are no z variables in this equation so plugging in z = -3 is irrelevant
• Simplifying our equation we now have: 3(4) + 4(1) = 12 + 4 = 16