Question

can someone help me, please
factor: 36n^2 - 81

Answer 1

(6n-9)(6n+9) Try it.

Answer 2

its the difference of 2 squares

a^2 - b^2 = (a - b)(a + b)

and 36n^2 = (6n)^2
81 = (9)^2

just plug in the values.

Answer 3

use this

a^2-b^2=(a+b)(a-b)

here a^2=36n^2
=>a=6n

b^2=81
=>b=9

now put values in above formula and get result.

Answer 4

thank you all