Question

prove that (a+b) (a-b)= a^2 - b^2​

Answer 1

Answer:

(a+b)(a-b) = a2-ab+ab-b2

(a+b)(a-b) = a2-b2

Answer 2

( a+ b ) ( a - b ) = a² - b²

solve for a

a² - b² = a² - b²

a² - b² - a² = - b²

- b² = - b²

b² = b²

true

a € r

slove for b

a² - b² = a² - b²

a² - b² + b² = a²

a² = a²

true

b € r