Question

HELP ME PLEASE !

1. What is the solution of n² – 49 = 0? (1 point)
–7
7
±7
no solution

2. What is the solution of x² + 64 = 0? (1 point)
–5
8
±8
no solution

3. What is the side length of a square with an area of 144x²? (1 point)
12
12x
±12x
no solution

5. What is the value of z so that –9 and 9 are both solutions of x² + z = 103? (1 point)
–22
3
22
184

Answer 1

These appear to be copy and pasted, why don't you describe to me what your problem is in solving these?

Answer 2

I know the first answer but I just don't understand how to get the answers. can u please explain the steps someone said u add the square root to the 49 but i get like 2. something if I do that

Answer 3

Ok, so if you look at:

n² – 49 = 0

we can rearrange it by adding 49 to both sides, since that will still keep it equal on both sides, right?

n²=49

Now we can say, hey, what multiplied by itself is 49?

I suggest you rearrange most of the problems similarly to this, and keep in mind that a negative number times a negative number is a positive number.

Answer 4

So it would look like this 49^2=49?

Answer 5

or 49^2-49=0?

Answer 6

I got 2.35?

Answer 7

No, it will look like this:

n² – 49 = 0

add 49 to both sides, since changing both sides by the same amount keeps it equal.

n² – 49 +49= 0+49

Now you can simplify it to

n² =49

and the take the square root of both sides

n=7 and n=-7

Show me what you're doing to get 2.35, because that is just plain wrong and I want to help you figure out where you need to fix it so you can get it right. =)

Answer 8

Oh okay I understand it now thank you! does square root mean basically 7*7 cuz that equals 49? I was doing it in the calculator wrong that is why I got 2.35

Answer 9

so the next one would look like this x^2+64=0
then x^2+64+64=0+64
then simplify x^2=64
=8 =)

Answer 10

You square root it to get rid of the n^2. and when solving equations what you do to one side you must apply to both sides. the sqrt of 49 is 7 because 7x7=49. :)

Answer 11

and yep, you got that last one correct! good job.

Answer 12

1 is b 2 is d 3 is a