Question

if a-b=3 and ab=10then find the value of a2+b2-2ab​

Answer 1

Answer:

given that - a-b=3

and ab=10

Step-by-step explanation:

it is given that find the value of a²+b²-2ab

-(a-b)²-2ab

-(3)²-2*10

9-20

-11

therefore answer is -11

Answer 2

Step-by-step explanation:

a-b=3.........(I)

ab=10.........(II)

From (I) :-

a-b=3

a=3+b.........(III)

Now, putting the value a=3+b in (III) :-

ab=10

(3+b)*b=10

3b+b²=10

b²+3b-10=0

b²+5b-2b-10=0

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

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