Question

If 9 : x = x : 4, then x = _____

Answer 1

Step-by-step explanation:

Explanation:

9

:

x

as

x

:

4

∴

9

x

=

x

4

x

2

=

36

x

=

±

√

36

x

=

±

6

Answer 2

Step-by-step explanation:

$\tt{ 9:x=x:4 }$ ⠀

$\tt{\dfrac{9}{x}=\dfrac{x}{4} }$ ⠀

$\tt{x×x=9×4 }$ ⠀

$\tt{ x^2=36 }$ ⠀

$\tt{ x=\sqrt{36}}$ ⠀

$\tt{ x=6 ~and~x=-6 }$ ⠀