Question

factorisation type questions .

please help......​

Answer 1

first 4 questions do it by yourself ,

5th

(180)³+(20)³/(180)² + (20)² -180*20

if we know the formula

(a³+b³) = (a+b)(a²+b²-ab)

it will take only 5 second .

so,

(180+20)((180)² + (20)² -180*20)/(180)² + (20)² -180*20

= (180+20)

= 200 (Ans.)