Question

The factors of 9x2 - 25 are ....​

Answer 1

$9 {x}^{2} - 25 \\ {(3x)}^{2} - {(5)}^{2} \\ (3x + 5)(3x - 5) \\ x = \frac{ - 5}{3} \: or \: \frac{5}{3}$

Answer 2

Answer:

Step-by-step explanation:

We know 9x  

2

−25 = (3x)  

2

−(5)  

2

 

Using identity a  

2

−b  

2

=(a+b)(a−b)

∴(3x)  

2

−(5)  

2

=(3x+5)(3x−5)