math
posted by Sabrina .
how to factor
9x8745x4+1296
by
9x416??
Thankyou!!

Online "^" is used to indicate an exponent.
9x^8  745x^4 + 1296
Find factors for 1296 (2 * 2 * 2 * 2 * 9 * 9)
See how those can combine with factors of 9 from the first term to give the middle term.
9x^8  745x^4 + 1296 = (9x^4  16)(x^4  81)