Question

Solve this equation using an algebraic method: (x + 4)( x - 4) = 9​

Answer 1

Answer:

x=5 use the identity (a square - b square)

Answer 2

Answer:

(x+4)(x-4)=9

x^2-4^2=9

x^2-16=9

x^2=9+16

x^2 =25

x=5