Question

It a+b = 7 & ab = 10
the a - b= ?​

Answer 1

Step-by-step explanation:

a+b= 7 and

ab= 10

a= 10/b

So 10/b +b=7

10+b^2= 7b

b^2-7b+10=0

b^2-2b-5b+10=0

b(b-2)-5(b-2)=0

(b-2)(b-5)=0

b= 2or 5

a=5or 2

so a-b= 3

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Answer 2

Step-by-step explanation:

a+b=7

a=7-b

and ab=10

(7-b)b=10

7b-b^2-10=0

b^2-7b+10=0

b=2,5

so,a+b=7

a=5,2

now,a-b=-3 or 3

hope this helps you better