Factor expression 16x2 - 25y2

Answer 1

Remember both 16 & 25 are squared numbers.

16 = 4^2 & 25 = 5^2

Hence we can write

(4x)^2 - (5y)^2

Remember two squared terms with a NEGATIVE Between them will factor.

( 4x - 5y)(4x + 5y)

Note the difference signs.

NNB Two squared terms with a positive (+) between them DOES NOT factor.

Answer 2

(4x-5y)(4x+5y)