7. Jika a=3danb=-2 ,makanilaidari2a2 –3ab+b2 ,jika adalah.....

a = 3, b = -2
2a^2 - 3ab + b^2
= 2(3)^2 - 3(3)(-2) + (-2)^2
= 2(9) - 3(-6) + (4)
= 18+18+4
= 40