Solve the Expression: a + b(a+1) with a=2 and b=-3

Question

$a+b\cdot(a+1)=$

Replace and calculate if $a=2,b=-3$

00:09 Let's set up our equation and calculate step by step.

00:13 We'll put in the right values as given. Remember to always notice those parentheses.

00:39 A positive number times a negative one, will always give a negative result.

00:46 Next, calculate everything that's inside the parentheses first.

00:52 Remember to do multiplication and division before moving on to addition and subtraction.

00:58 Let's keep solving this, following the correct order of operations.

01:02 And that's how we find the solution to our question. Well done!

Let's substitute the numbers into the formula:

$2+(-3)\times(2+1)=$

Let's remember the rule:

$+(-x)=-x$

Let's write the exercise in the appropriate form:

$2-3\times(2+1)=$

Let's solve the expression in parentheses:

$2+1=3$

Now we get the exercise:

$2-3\times3=$

Now let's solve the multiplication exercise:

$3\times3=9$

Now we get the exercise:

$2-9=$

Therefore, the answer is:

$-7$

$-7$