Question

Si x = 3 ; y = 2. Hallar el valor de 3x2 - 5xy +4y2

Answer 1

3*2-5(3)(2)+4(2)(2)=-8

Answer 2

3x2 - 5xy + 4y2 =

3(3^2) - 5(3×2) + 4(2^2) =
(3^2)= 3×3 = 9
(2^2) = 2×2 = 4

3(9) - 5(6) + 4(4)

27 - 30 + 16 = 13