Question

Solve this with this identity: (a – b)2 = a2 – 2ab + b2
$(5x-2)^{2}$

Answer 1

Answer:

As given in the Question- (a+b)  

2

=a  

2

+2ab+b  

2

 

Using this Identity,

(2p+3q)  

2

 =(2p)  

2

+2(2p×3q)+(3q)  

2

 

= 4p  

2

+2(6pq)+9q  

2

 

= 4p  

2

+12pq+9q  

2

Answer 2

$\huge\bigstar\underline\mathbb\red{Answer} \bigstar$

$\huge\mathbb\purple{formula}$

$( {a - b})^{2} = {a}^{2} + {b}^{2} + 2ab \\ \\ or \\ \\ = {a}^{2} - 2ab + {b}^{2}$

$\huge\mathbb\purple{solution}$

$( {5x - 2})^{2} \\ \\ = ({5x})^{2} + ( {2})^{2} - 2 \times 5x \times 2 \\ \\ = {25x}^{2} + 4 - 20x \\ \\ or \\ \\ = {25x}^{2} - 20x + 4.$