Question

X square + 4 / x square minus 4 is equals to 4 upon 5

Answer 1

Given (x^2 + 4)/(x^2 - 4) = 4/5

On cross-multiplication, we get

5(x^2 + 4) = 4(x^2 - 4)

5x^2 + 20 = 4x^2 - 16

5x^2 = 4x^2 - 16 - 20

5x^2 = 4x^2 - 36

5x^2 - 4x^2 = - 36

x^2 = -36

x = 6i (or) -6i.


Hope this helps!

Answer 2

$\frac{x^{2}+4 }{ x^{2} -4} = \frac{4}{5}$
$5( x^{2} +4)=4( x^{2} -4)$
$5 x^{2} +20=4 x^{2} -16$
$5 x^{2} -4 x^{2} =-20-16$
$x^{2} =-36$

This question is somewhere wrong as there is no negative square number. Answer comes 6i