Question

4. Find the value of a-b, if a+b=3 ,ab=2​

Answer 1

a+b=3

ab=2

If a+b=3

a=3-b

so, (3-b)b = 2

3b-b² = 2

b²-3b = -2

b²-3b+2 = 0

b²-2b-b+2 = 0

b(b-2)-1(b-2) = 0

(b-1)(b-2) = 0

b = 1,2

If b = 1 then a=2

b=2 then a=1

So, a-b = 1 or a-b = -1

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Answer 2

Answer:

here is your answer

Step-by-step explanation:

given,

a+b=3.......1

ab=2..........2

from 1:. a=3-b......3

subs. 3 in a-b

(3-b)-b

=3-2b

2b=3

b=3/2.............4

subs 4 in a-b

a-(3/2)=0

a=3/2