Question

solve this question using Algebric Method (x+4) (x-4)=9
A. x=5 and x=-5
B. x=5
C. x=9
D. x=4 and x=-4​

Answer 1

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

(x^2-4^2)=9

x^2-16=9

x^2=9+16

x^2=25

x=√25

x=5

So ans is B

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Answer 2

Answer:

x = 5 or x = -5

Step-by-step explanation:

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

(a + b) (a - b) = a² - b²

(x + 4) (x - 4) = x² - 16

= x² - 16 = 9

= x² = 25

x = √25 = 5

x = - 5 also