Question

Solve
by
the quadratic equation
factorization method :
X2 - 9=0​

Answer 1

Answer:

X= 3,- 3

Step-by-step explanation:

X^2-(3)^2= 0

(X+3) (x-3) = 0

X= 3, -3

OR

X^2-9 = 0

This equation similar to

ax^2 + bx + c=0

Compare two equations

a= 1, b = 0,c= -9

X=[ -b +√(b^2-4ac)] /2a

= [0+√(-4×1×-9]] )/(2×1)

√36/2=6/2=3

Substitute a, b, c values in

X= [-b-√(b^2-4ac)] /2a

X= - 3