Step-by-step explanation:
then let's do the multiplication, it is really not difficult :
base × height =
= (2x² + 2x - 6)(x - 4) =
= 2x³ + 2x² - 6x - 8x² - 8x + 24 =
= 2x³ - 6x² - 14x +24 cm²
so, the second answer is correct.
