Answer:
opening the bracket, the expression becomes
12x^2-28-19x^2
collect like terms
12x2-19x^2-28
-7x^2-28
-7(x^2+4)
It is 24 letter b you are adding
Because if you do 3*5 that equals 15. if you flip that, 5*3, you still get 15, so it doesn't matter which order you multiply something, the answer will still be the same
(9×10)+(7×1)+(3×0.1)+(5×0.01)+(6×0.001)
A=-12
B=-6
C=0
I hope this helps!
