Question

Plz guys tell me how (alpha+ beta )-4 alpha beta=1 occurred?

Answer 1

Answer:

Explanation:

Let alpha be a and beta be b

(a+b)^2 = a^2 + b^2 + 2ab

a^2+ b^2=(a+b)^2 - 2ab..........(i)

Now, (a-b)^2= a^2+b^2 - 2ab

From (i),

(a-b)^2=(a+b)^2 -2ab - 2ab

=(a+b)^2 - 4ab