Algebra

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a=2, b=-4, c=-3

a³ - 2b - 4c²

As before, start with the "Not thinking" line:
2³ -8x(-4) -4x(-3)²

now sort out the numbers:
8 not 6!!!! It's 2x2x2 = 4x2 = 8
+ 32 minus times a minus is a plus
- 36 do it carefully, (-3)² = +9, -4x9 = -36
= 4

This is the explanation on a website my daughter has been pointed to by her teacher.
 
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