(a−b)(a+b)=a2−b2∴(4x/5−3y/4)(4x/5+3y/4)=(4x5)2−(3y4)2=(16x225)−(9y216)
Question 85 (viii)
Expand the following, using suitable identities.
(4x5+y4)(4x5+3y4)
The distance between the parallel lines 4x-3y+5=0 and 4x-3y+15 =0 is: