-(f %2B c - 3*d)^2 %2B (f %2B c %2B 3*d)^2 – InterviewSolution

1.

-(f %2B c - 3d)^2 %2B (f %2B c %2B 3d)^2

Answer»

12cd+12df this is right answer of this question

use (a+b)²&(a+b)²=c²+(3d+f)² + 2c(3d+f) - [c²+(3d+f)² - 2c(3d+f) ]

=c²+(3d+f)²+ 2c(3d+f) - c² - (3d+f)² +2c(3d+f)

=4c(3d+f) answer

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