Question

a-b=7 and ab=9 then the value of a²+b² is:​

Answer 1

a-b = 7 then

a = 7+b —————— (1)

ab=9 then

putting ‘a’ value as above

7+b (b) = 9

7+b^2 = 9 then b^2 = 9–2 which means, b^2 = 2 ————— (2)

Now apply this to a^2+b^2

Let’s imagine a^2+b^2 = 0 then,

a^2+2 = 0 [applying the value of (2) for b^2] then,

a^2 = -2 ———————- (3)

Now we have values of a^2 and b^2, lets apply to a^2+b^2

(-2) + 2 = 0

Proved.


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Answer 2

Answer:

a²+b²= (a-b)² +2ab

= (7)² +2×9

= 49+18

= 67 is ur correct answer please follow me