Question

If x = 3 , y = -2, z = 5 then find the value of the following 3x2 - 4y2 + 5z2

Answer 1

x=3 y= -2 z= 5

3(3)2 - 4(-2)2 + 5(5)2

18 - (-16) + (50)

18+16+50 = 84

Answer 2

x=3 y=-2. z=5

3×3×2 - 4×-2×2+ 5×5×2

=84