2 – 50x2=?
2 – 50x2= 2(1 – 25x2) (taking 2 as common from whole)
= 2(1 – 5x)(1 + 5x) a2 – b2 = (a – b)(a + b)
a2 – b2 = (a – b)(a + b) a2 – b2 = (a – b)(a + b)