Question 3556
 3(4-6)²-2(4-3)
=3(-2)²-2(1)   (since 4-6=-2 and 4-3 = 1)
=3*4-2 (since (-2)²=(2²) because (-§)*(-§) gives §*§ = §²)
=12-2 (since 3*4 is 12)
=10
i hope you understand these things, they are the most fundamental things in math so make sure you understand them.

Greets