Question

(2 + a)(2-a) evaluate by using direct method

Answer 1

Answer:

4-a²

Step-by-step explanation:

applying (a²-b²) formula we get,

=2²-a²

=4-a²

Answer 2

Answer:

$(2 + a)(2 - a) \\ = 2(2 - a) + a(2 - a) \\ = 4 - 2a + 2a - {a}^{2} \\ = 4 - {a}^{2} \\ or \: \\ \: \: \: by \: \: using \: \: this \: \: identity \: \\ (x + y)(x - y) = {x}^{2} - {y}^{2} \\ (2 + a)(2 - a) = {2}^{2} - {a}^{2} \\ = 4 - {a}^{2}$

I hope it will help you