help with math it's very very simple, easy 10 points!!!?

22

substitute -2 for r
6(-2)^2 - 9 + 7
6 (4) - 9 + 7
24 - 9 + 7
= 22

1st interpretation:
= 6(r² - 9) + 7
= 6(- 2² - 9) + 7
= 6(4 - 9) + 7
= 6(- 5) + 7
= - 30 + 7
= - 23

Answer: - 23

2nd interpretation:
= 6r² - 9 + 7
= 6(- 2²) - 2
= 6(4) - 2
= 24 - 2
= 22

Answer: 22

6 (-2)(-2) - 9 + 7
6 x 4 - 2
24 - 2
22

If question was meant to read:-
6 r ² - 9 r + 7
6 (- 2)(- 2) - 9 (- 2) + 7
6 x 4 + 18 + 7
24 + 25
49

6r^2 - 9 + 7
= 6 x -2^2 - 9 + 7
= 6 x 4 - 9 + 7
= 24 - 9 + 7
= 15 + 7
= 22

Here:
6(-2^2)-9+7
6(-4)-9+7
-24-9+7
-33+7
-26

well just substitute your values and you'll get your answer!

6r²-9+7=n

6(-2)²-9+7=n (substitute -2 to r and don't forget the brackets to avoid confusion!)

6(4)-9+7=n (since -2 times -2 is = 4 {two negative numbers multiplied would produce a positive number})

24-9+7=n (multiply 6 to 4 which is 24)

15+7=n (subtract 9 from 24)

22=n (add 7 to 15)

22 is the answer.

hope this helps!

you have to plug r= -2 into the equation "6r^2-9+7"
6( - 2) ^2 - 9 + 7= 24 - 9 + 7 = 22
be careful the square of (-2) is 4. Because (-2)^2=(-2)(-2) = 4
Regards/

What you need to do is use the order of operations. I learned it in the acyronoym "Please excuse my dear aunt sally". The P means parathenesses. The E is meant for the exponents. The M and D should be done left to right and mean multiply and divide. Finally the S and A should also be read from left to right. They mean to add and subtract.

What you need to do is put the -2 in for r.
The problem will look like
6*(-2*-2)+7
Nextly solve for r squared
The problem should now look like
6*(4)+7
Then multiply the 6 and the 4 due to the order of operations.
24+7
Finally add the two remaining numbers together and the final anwser should be 31.












Hope this helps,
yunieyuna2002

you have to put the -2 into the expression wherever you see an r, so:
6(-2)^2-9(-2)+7 =
6(4) -(-18) +7
24+18+7
=49

6(-2)^2-9+2=22