Answer:
9x² - 49
Step-by-step explanation:
A difference of squares factors in general as
a² - b² = (a + b)(a - b)
Given (3x + 7) with a = 3x and b = 7
Then the other factor is (3x - 7)
(3x + 7)(3x - 7)
= (3x)² - 7²
= 9x² - 49
Nvm
Step-by-step explanation:
3 dollars. You take 60 and multiply it by 5%

- Now, we know cos(60°) =
. So put the value there.

Hence LHS = RHS [Proved]
Hope you could understand.
If you have any query, feel free to ask.
Answer:3 hours
Step-by-step explanation:8-5=3, 3-5=-2, -2-5=-7