131k views
3 votes
Factor the difference of 81x^4 - 625

1 Answer

5 votes

81x^4 - 625


= (9x^2)^2 - (25)^2


= (9x^2 + 25)(9x^2 - 25)


= (9x^2 + 25)( (3x)^2 - (5)^2)


= (9x^2 + 25)( 3x - 5)(3x + 5)


User Colin Thomsen
by
6.7k points