need help answering

Question

A polynomial P is given.

P(x) = x⁴ + 8x² − 9

(a) Factor P into linear and irreducible quadratic factors with real coefficients. 

P(x)

Answer 1

x⁴ + 8x² - 9

(x² + 9)(x² - 1)

(x² + 9)(x + 1)(x - 1)