Question

Read the question in the picture .

Answer 1

Answer:

3 and -3

Step-by-step explanation:

9x^2 -81 =0

(3x)^2 - (9)2 = 0

Using the identity (a^2 - b^2) = (a + b) (a - b)

(3x + 9) (3x - 9) = 0

Case 1:

3x = -9

x = -9/3

x = -3

case 2:

3x = 9

x = 9/3

x = 3  

Answer 2

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