Factor the expression X^4+6X^2 - 7 completely.

Answer: (x - 1) (x + 1) (x + 7) ²

Step-by-step explanation:

x⁴ + 6x² - 7

find two numbers whose product is - 7 and sum is + 6 - -> - 1 & 7

Those values go into the parenthesis: (x² - 1) (x + 7) ²

Notice that (x² - 1) is the difference of squares - -> (x - 1) (x + 1)