Question

(2a + 7) (2a – 7) explain it with step by step and which identity used.​

Answer 1

Answer:

(2a−7)(2a−7)=(2a−7)  

2

 

using identity (a−b)  

2

=a  

2

−2ab+b  

2

 

(2a−7)  

2

=(2a)  

2

−2×2a×7+7  

2

 

(2a−7)  

2

=4a  

2

−28a+49

Step-by-step explanation:

Answer 2

Answer:

solution in above attachment