Question

1. $3a^2 - ab$ (if $a = -4$ and $b = -3$)

Explanation:

Step1: Substitute given values

Substitute $a=-4$, $b=-3$ into $3a^2 - ab$:
$3(-4)^2 - (-4)(-3)$

Step2: Calculate exponents and products

First compute $(-4)^2=16$, then products:
$3\times16 - 12$

Step3: Compute final result

Calculate multiplication then subtraction:
$48 - 12$

Answer:

36