Question

If x = 1, y = 2 and z = 5, find the value of 5x2 − 3y2 + 2z2

Answer 1

Answer:

5x^2-3y^2+2z^2 = 5(1) ^2-3(2) ^2+2(5) ^2

= 5 - 12 + 50

= 43 ans.

Answer 2

Answer:

5x2 - 3y2 + 2z2

= 5×x×2 - 3×y×2 + 2×z×2

NOW PLACE THE NUMBERS

= 5×1×2 - 3×2×2 + 2×5×2

= 10-12+20

= 18