Question

x⁴-17x²+72=0 ayudenme por favor

Answer 1

X⁴-17x²+72=0
($x^{2}$-9)($x^{2}$-8)=0

($x^{2}$-9)=0
$x^{2}$=9
$\sqrt{ x^{2} } = \sqrt{9}$
$x_{1}$ = 3

($x^{2}$-8)=0
($x^{2}$=8
$\sqrt{ x^{2} } = \sqrt{8}$
$x_{2}$= 2.828