Question

using identity solve (X+9) (x-9)​

Answer 1

Answer:

(a+b) (a-b)=a²-b²

x²-9²

x²-81 is the answer of this question

Answer 2

Answer:

Answer = x² - 81

Step-by-step explanation:

Q. using identity solve :

(x+9) (x-9)

Solution:

We can solve this by using Identity II :

$(a + b)(a - b) = {a}^{2} - {b}^{2}$

Let, here a = x and b = 9,

∴,

$(x + 9)(x - 9)$

$= {x}^{2} - {9}^{2}$

= x² - 81