Question

If a + b = 7 & a2 + b2 = 65, find the value of ab.​

Answer 1

Step-by-step explanation:

(a+b)²=a²+b²+2ab

49=65+2ab

-16=2ab

ab=-8

mark me as brainliest

Answer 2

Here,

a+b = 7

a²+b² = 65

ab = ?

a²+b² = (a+b)²-2ab

or, 65 = 7²-2ab

or, 65 = 49 - 2ab

or, 65+2ab = 49

or, 2ab = 49-65

or, 2ab = -16

or, ab = -16/2

= -8

Thus, ab = -8

I hope this helps.