Answer:
3
Step-by-step explanation:
There are a significant number of minus signs here. We can simplify it a bit by factoring out -x:
= -x(x +4)
When we substitute x = -3, we get ...
= -(-3)(-3 +4)
= 3(1)
= 3
4.2
Check the picture below.
I don't see a red triangle. btw, it's (120 × 50) / 2 = 6000 / 2 = 3000 mm².
D
log3
