Question

What is the factored form of x2−9

Answer 1

Answer

(x-3)(x+3)

Step-by-step explanation:

X^2-9 is a difference of squares
You can check it by FOIL
X times X = x^2
x times 3= 3x
-3 times x= -3x
-3 times 3=-9

Add it together : x^2 + 3x-3x-9

You get: x^2-9

Answer 2

(x+3)(x-3)

Step-by-step explanation:

When factoring x^2-9 you'd look for square multiples of -9.

Because 3×3 is 9, 3 is your square. You can't just use (x+3) because your outcome is a -9. Which is why your answer would be (x+3)(x-3)