Question

Factorize :- x⁴ -8x² -9= 0

Answer 1

$\bf HELLO \: \: DEAR,$


$\\ \\ \bf x^{4} - 8x^{2} - 9 = 0 \\ \\ \bf x^{4} - 9x^{2} + x^{2} - 9 = 0 \\ \\ \bf x^{2}(x^{2} - 9) + 1(x^{2} - 9) = 0 \\ \\ \bf (x^{2} + 1)(x^{2} - 9) = 0 \\ \\ \bf x^{2} = -1 [ neglect] \\ \\ \: \: \: \: \: \: \bf \: or \\ \\ \bf x^{2} = 9 \\ \\ \bf x = +_-3$


$\underline{\bf I \: \: HOPE \: \: ITS \: \: HELP \: \: YOU \: \: DEAR, \: \: THANKS}$

Answer 2

hope this solution will help you