

InterviewSolution
Saved Bookmarks
1. |
Expand using appropriate identities:(3x)2 – 52 |
Answer» (3x)2 – 52 Comparing (3x)2 – 52 with a2 – b2 we have a = 3x; b = 5 (a2 – b2) = (a + b)(a – b) (3x)2 – 52 = (3x + 5)(3x – 5) = 3x(3x – 5) + 5(3x – 5) = (3x) (3x) – (3x)(5) + 5(3x) – 5(5) = 9x2 – 15x + 15x – 25 = 9x2 – 25 |
|