Question

The factors 9a^2 - 4 are
a) (3a + 2)(3a - 2)
b) 9a + 12
c) (4a + 13)(4a - 13)
d) 81a - 32

Answer 1

Step-by-step explanation:

a)a=2-3

a= -1

hope it helps.

Answer 2

Answer:

a) (3a+2)(3a-2)

Step-by-step explanation:

METHOD—1

let us do option verification

option a) : (3a+2)(3a-2)

(3a)² - (2)² [ since (a+b)(a-b)=a²-b² ]

9a² - 4

as we got the correct equation option is the answer.

so,option a) (3a+2)(3a-2) are the factors of the given equation.

METHOD—2

Given equation : 9a²-4

(3a)²-(2)²

(3a+2)(3a-2) [ since, a²-b² = (a+b)(a-b) ]

(3a+2)(3a-2) are the factors of the given equation .

so, option a) is correct.