Question: Simplify:
427 -7

A ) 7 + 7
B ) 7 +742
C ) 14 - 27
D ) 7 - 7

Steps to derive

1 427 -7

2 = 427 -7 × 7 +77 +7
 [7 + 7 is the conjugate of 7 - 7.]

3 = 42(7 +7)(7 -7)(7 +7)

4 = 42(7 +7)72 -(7)2
 [(a - b)(a + b) = a² - b².]

5 = 42(7 +7)49 - 7

6 = 7 + 7



Hence the right answer is Option A

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