Solve the equation. If necessary, round your answer to the nearest tenth.

x2 = 256

A.
128

B.
128, –128

C.
16, –16

D.
16

Question

Solve the equation. If necessary, round your answer to the nearest tenth.
  
        x2 = 256 
 
 A.
128
 
 B.
128, –128
 
 C.
16, –16
 
 D.
16

cheez · Answer

I am guessing this is x^2 and not 2x.

sqrtx^2 = sqrt256
x = 16.

cheez · Answer

BUT it can be both negative and positive, so C.

errinss · Answer

ya i meant to make it the 2 an exponent

errinss · Answer

Solve the equation. If necessary, round your answer to the nearest tenth.
 
        4x2 = 81
 
 A.
2.25, –2.25
 
 B.
4.5, –4.5
 
 C.
9, –9
 
 D.
20.25, –20.25

errinss · Answer

$$4x^{2}=81$$

cheez · Answer

First, for your second one, try dividing both sides by 4. what do you get?

(imma let you try to do this one on ur own.)

errinss · Answer

i got 20.25

cheez · Answer

good. Now, square root both sides again. You should get--- x = ?

Find ?

errinss · Answer

4.5?

cheez · Answer

yes! Great job! but it can be both negative or positive, so C. again.

cheez · Answer

I meant B. :P

cheez · Answer

need any more help?

errinss · Answer

ya

cheez · Answer

Ok, shoot

errinss · Answer

What is the value of x? Round your answer to the nearest tenth.
 
x^2 = 112

cheez · Answer

Easy! do the same as the first one, sqrt both sides. What do you get?

errinss · Answer

10.583005244258362362006463014557
this is what i got...

cheez · Answer

Ok so now round it up. 8 is greater than 5, so it becomes 10.6

errinss · Answer

but wouldn't you round in the tenths place instead of the hundredths place

cheez · Answer

and no it's not is it greater than the number before it. if you have at least .5 behind a number, you round it up.


For example: 6.26
because 6 is greater than 5, you round it up to 6.3

cheez · Answer

10.6 is the tenths place. 

x = a number. 

.x = tenths
.xx = hundredths
.xxx = thousandths

and so on.

errinss · Answer

oh that makes sense lol

cheez · Answer

Hope I helped!

cheez · Answer

If you ever need help just tag me. y'know with the @ thing.

errinss · Answer

ya can you help me with 1 more?

errinss · Answer

$$4y^{2}+8=264$$

errinss · Answer

what is y?

pooja195 · Answer

can you make a new post?

errinss · Answer

ya

cheez · Answer

Sorry I was AFK for a sec. @errinss 

make the X all by itself. by that I mean subtract 8 from both sides. 

Thus, you get 4y^2 = 256
Divide both sides by 4, then square root both sides of the new equation. 

you should get y = 8.