Question

if a + b is equal to 5 and a square + b square is equal to 40 then what is the value of AB​

Answer 1

Step-by-step explanation:

a + b = 5

a² + b² = 40

ab = ?

we know that,

(a² +b²) = (a + b )² - 2ab

40 = (5)² - 2ab

40 = 25 - 2ab

40 -25 = -2ab

15 = -2ab

-15/2 = ab