Question

Find the following products (2/b-5/c)(2/b+5/c)

Answer 1

Step-by-step explanation:

= (2/b - 5/c)(2/b + 5/c)

= (2/b)^2 - (5/c)^2. {(a+b)(a-b) = a^2 - b^2}

= (4/b^2) - (25/c^2)

= (4c^2 - 25b^2) / (b^2 * c^2)

Answer 2

by using Formula a² – b²

(2/b) ² –( 5/c)²

4/b² – 25 / c²