Question

If a + b = 7 and a² + b² =65
find the value of ab​

Answer 1

Answer:

(a+b)^2= a^2+b^2+2ab

7^2=65+2ab

49-65=2ab

-16=2ab

hence ab=-16/2= -

hope this helps

Answer 2

Step-by-step explanation:

(a+b) square = a square + b square + 2ab

(7) square = 65 + 2ab

49-65 = 2ab

-16= 2ab

ab = -8

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