Solve a(ab+3): Evaluating the Expression When a=-1 and b=5

Let's begin by inserting the numbers into the formula:

$-1\times(-1\times5+3)=$

We must remember the following rule:

$(-x)\times(+x)=-x$

Let's now solve the expression inside of the parentheses:

$(-1\times5+3)=$

$-1\times5=-5$

$-5+3=-2$

We should obtain the following expression:

$-1\times(-2)=$

Let's again remember the rule:

$(-x)\times(-x)=+x$

Therefore, the correct answer is:

$2$