what is the value of -3mn + 4m - 3 when m = 2 and n = -4?\n-43\n-40\n5\n29

Explanation:

Step1: Substitute values

Substitute $m = 2$ and $n=-4$ into $-3mn + 4m-3$. $-3\times2\times(-4)+4\times2 - 3$

Step2: Calculate $-3\times2\times(-4)$

$-3\times2=-6$, then $-6\times(-4) = 24$. The expression becomes $24+4\times2 - 3$

Step3: Calculate $4\times2$

$4\times2 = 8$. The expression is now $24 + 8-3$

Step4: Calculate $24 + 8$

$24+8=32$. The expression is $32-3$

Step5: Calculate $32-3$

$32 - 3=29$

Answer:

29