Question

I’m supposed to write exactly what I entered in the calculator but I got it wrong and now I’m correcting, I don’t see what I did wrong can someone help me please!!

Answer 1

Answer:

Answer: 41

The thing to evaluate: $-(-4)+7(3)+(-4)^2$

The thing to type into the calculator: -(-4)+(7)(3)+(-4)^2

Step-by-step explanation:

So I like to put parenthesis around my inputs every single time so I don't go wrong.  You can sometimes get away without doing it but sometimes your calculator will return incorrect value.

Your calculator returned incorrect value because you were suppose to enter $(-4)^2$ instead of $-4^2$.

These values are different. The first is equal to (-4)(-4)=16 and the second is equal to -(4)(4)=-16.

Also if c=-4 then -c=-(-4).

So this is what I would type into my calculator:

-(-4)+(7)(3)+(-4)^2

If you want to perform the order of operations, you do:

1) Parenthesis (grouping symbols)

Notice your parenthesis here don't have any operations to perform.

So move on to the next step.

2) Exponents

You do have this as the end.

$-(-4)+7(3)+(-4)^2$

$-(-4)+7(3)+16$

3) Multiplication/Division as it occurs left to right

I see the opposite of -4 part and 7(3).

$4+21+16$

4) Addition/Subtraction as it occurs left to right

$25+16$

$41$