Question

If a+b=4 and ab= –12 , find i) a-b & ii) a²-b²

please help me out with this answer​

Answer 1

Answer:

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Answer 2

Answer:

a+b = 3 and ab= -12

then, b= 3-a

and a(3-a) = -12

or, 3a-a^2 = -12

or, a^2 -3a -12 = 0

or, a= 3+√9+48 / 2