$-4x^{-4}-3x^{-2}+1=0\\
-4x^{-4}-4x^{-2}+x^{-2}+1=0\\
-4x^{-2}(x^{-2}+1)+1(x^{-2}+1)=0\\
-(4x^{-2}-1)(x^{-2}+1)=0\\
4x^{-2}-1 =0 \vee x^{-2}+1=0\\
4x^{-2} =1 \vee x^{-2}=-1\\
x^{-2}=\frac{1}{4} \vee \frac{1}{x^2}=-1\\
\frac{1}{x^2}=\frac{1}{4}\\
x=-2 \vee x=2
$

7 0

3 years ago

25% of a number is 8.<br> What is the original number?

miss Akunina [59]

Answer:

B. 32

Step-by-step explanation:

25% is 1/4 of 100%, so you multiply 8 by 4.

5 0

3 years ago

Pls help me It’s urgent‼️‼️

Otrada [13]

Answer:

the answer is 3/10

I hope it may help you

7 0

3 years ago

max ran a race in 55.6 seconds. jack ran the race 5.68 seconds slower than max. how fast did jack run the race

otez555 [7]

Answer:

49.92

Step-by-step explanation:

take 55.6 then subtract 5.68

6 0

4 years ago