Question

if (a+b)=40 and (a-b)=20 then find (a²-b²)​

Answer 1

Step-by-step explanation:

a²-b²

(a+b)(a-b)

40×20

800

Answer 2

$Hence,\:(a^{2} - {b}^{2} ) = (a + b)(a - b) \\ = (40)(20) \\ = 40 \times 20 \\ = 800$