Question

Answer the following
Use identity a suitable identity & simplify
1. (x+3) (x+3)
2. (6x+7) (6x-7)
3. (b-7)^2
4. (2x+5) (4x-3)
5. (3x+2)^2​

Answer 1

1 ) ( x + 3 ) ( x + 3 )

( x + 3 ) ²

x² + 6x + 9

2 ) ( 6x + 7 ) ( 6x - 7 )

( 6x ) ² - 7 ²

6 ² x ² - 7 ²

36x² - 7 ²

36x² - 49

3 ) ( b - 7 ) ²

b² - 14b + 49

4 ) ( 2x + 5 ) ( 4x - 3 )

8x² - 6x + 20x - 15

8x² + 14x - 15

5 ) ( 3x + 2 ) ²

9x² + 12x + 4