Question

(1) Factorise x2-9



plz urgently work​

Answer 1

Answer:

(X+3)(X-3)

Step-by-step explanation:

X²-9

= (X)²-(3)²

= (X+3)(X-3)

Answer 2

One way to solve the quadratic equation x2 = 9 is to subtract 9 from both sides to get one side equal to 0: x2 – 9 = 0. The expression on the left can be factored: (x + 3)(x – 3) = 0. Using the zero factor property, you know this means x + 3 = 0 or x – 3 = 0, so x = −3 or 3.