So my question is for the people that got (-1), how are you getting (-25) from the first exponent?

Question

Thanks for all the answers everyone!

Unfortunantly, I am still having the same problem. The answer that I get answer is 49, but the answer provided is -1. Which I can see how it is possible to get that number. If a the first part of the problem you get a negetive 25 insted of a positive by multipying -5 by an exponent of 2. Now it is my understanding that by multiplying a number by an exponent of 2, you actualy multiply the number by its self. And a negetive times a negetive is a positive.

So my question is for the people that got (-1), how are you getting (-25) from the first exponent?

Answer 1

Simplify the following expression using PEMDAS which, stands for parenthesis, multiplication, division, addition & subtraction.

-5^2 - 2 * 3^2 + 2[6 - 3(4 - 9)]

-5^2 - 2 * 3^2 + 2[6 - 3(-5)]

-5^2 - 2 * 3^2 + 2[6 - (-15)]

-5^2 - 2 * 3^2 + 2[6 +15]

-5^2 - 2 * 3^2 + 2[21]

-5^2 - 2 * 3^2 + 42

-5(5) - 2 * 3(3) + 42

-25 - 2 * 9 + 42

-25 - 18 + 42

- 43 + 42 = -1

P.S. when you have -5^2 the solution is -25 because -5 is not in parenthesis, you can also rewrite it as...
-(5^2) = -(25) = -25

Answer 2

You're asking why -5^2 equals -25.

Remember your order of operations, PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.

Exponents come before subtraction.

Therefore, you first resolve 5^2. That's 25.
Then you deal with the minus sign in front. That makes it -25.

-5^2 is -5*5
(-5)^2 is (-5)*(-5) - something very different.
Calculators will easily lead you astray on this point if you aren't careful.

Answer 3

-5^2 -2 * 3^2 +2 [6-3 (4-9)]?
Well you start with brackets
-5^2-2*3^2+2[6-3*-5]
within the bracket you do the multiplication first
-5^2-2*3^2+2[6-(-)15] so 6+15
-5^2 -2*3^2+2*21
then we do exponents
so 5^2=25
3^2=9 so
-25-2*9+2*21
then we multiply
25-18+42
42-18=24
24-25=-1

which follows the rules of bidmas
and we know (-5)^2 =25
but there are no brackets so we do the exponent before the minus because of the rules of bidmas
so we do-(5^2)
so we get -(25)
this does work although it is not very obvious

Answer 4

I don't know your original question, but you need to clear up your thinking about exponents -- you don't EVER multiply a number by its exponent. The exponent tells you how many of the base to multiply together.

So (-5)² = (-5)(-5) = 25. On the other hand, -5² means -(5)(5) = -25. The parentheses make all the difference. A TI graphing calculator is very sensitive to this difference.

Answer 5

I don't know the previous question so I can't say for sure, but if you have a problem like -(5^2) this equals -25 because the negative is on the outside of the parentheses.

But you are right that you will get only 25 if the problem looks like this (-5^2).

Answer 6

Please ask the whole question, so answerers know what it is.

I'd like to help

Answer 7

where is the equation?