Answer :

On comparing with standard quadratic equation that is

we have,


a = 20, b = – 26 and c = 8


Now here,


Product a × c = 20 × 8 = 160


Factors of 160; 2 × 80; 4 × 40; 8 × 20; 16 × 10; 32 × 5


Sum should be b = – 26x


From above factors ( – 16x – 10x)


will give – 26x sum


therefore – 26x is replaced by ( – 16x – 10x)


Now above eq. becomes



; taking 4x and – 2 common


2(2x – 1)(5x – 4)


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