Question

if a+b=4
ab=-12
find i)a-b
ii)a^2-b^2​

Answer 1

Answer:

(a−b)

2

=a

2

+b

2

−2ab+2ab−2ab=(a+b)

2

−4ab

⇒(a−b)

2

=16+48=64

⇒a−b=±8.

solution

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