Question

find the product of the ticked ones only in the image​

Answer 1

Answer:

Using identities:

1) (2.1g+d)(2.1g-d)

(a+b)(a-b)= a²-b²

(2.1g)²-d²

4.41g²-d²

2) (3x-2/7y)(3x+2/7y)

(3x)²-(2/7y)²

9x²- 4/49y²

3) (8b-1.1c)(8b+1.1c)

(8b)²-(1.1c)²

64b²- 1.21c²

The rest of your questions can also be solved using this identity.

Hope it helps you.

Please mark my answer as BRAINLIEST.

Answer 2

Step-by-step explanation:

iv. (2.1g)²-(d)² ( a+b × a-b) =a²-b²

4.41g²-d²

v.(3x)² - (2/7×y)² same formula

9x²- 4/49×y²

vi.(8b)²-(1.1c)² same formula

64b²- 1.21c²