Question

Q2. The value of (3a + 7b)² - ( 3a - 7b)² is hu​

Answer 1

Step-by-step explanation:

9a²+49b²+42ab-(9a²+49b²-42ab)

42ab+42ab

84ab is the answer of this question

Answer 2

Answer:

Identity is (a^2+b^2+c^2+2ab+2bc+2ca

now expand it by putting a=3a,b=(-7b),c=(-c)

substitute the value and you will get the answer

=9a^2+49b^2+c^2-42ab+14bc-6ca