Question

factorise 9/25y square-49/4y square

factorise 9 upon 25 y square - 49 upon 4 y square​

Answer 1

Step-by-step explanation:

9/25y^2 - 49/4y^2

= (3/5y)^2 - (7/2y)^2

= (3/5y - 7/2y) (3/5y + 7/2y) [using (a-b)(a+b) = a^2 - b^2]

= (-29/10y)(41/10y)

= -1189/100y^2