Question

X^4+ 4x² – 45 =0

factored form (x² - 5)(x² +9)=0


does anyone know how to solve this?

Answer 1

`( {x}^(2) - 5)( {x}^(2) + 9) = 0 \\ {x}^(2) - 5 = 0 \: \: \: \: \: \: \: \: {x}^(2) + 9 = 0 \\ {x}^(2) = 5 \: \: \: \: \: \: \: \: {x}^(2) = - 9 \\ x = √(5) \: \: \: \: \: \: \: \: x = √( - 9)`