Question

Expand :(5a+3b+2c)(5a-3b-2c)

Answer 1

Answer:

25a²+30ab+9b²-4c²

Explanation:

[(5a+3b)+(2c)][(5a-3b)-(2c)]

=(5a+3b)²-(2c)²=25a²+30ab+9b²-4c²

Answer 2

Answer:

Question :-

➙ (5a + 3b + 2c) (5a - 3b - 2c)

Answer :-

➙ (5a + 3b + 2c) (5a - 3b - 2c)

➻ 5a(5a - 3b - 2c) + 3b(5a - 3b - 2c) + 2c(5a - 3b - 2c)

➻ 25a² - 15ab - 10ac + 25ab - 9b² - 6bc + 10ac - 6bc - 4c²

➻ 25a² - 9b² - 4c² - 15ab + 25ab - 10ac + 10ac - 6bc - 6bc

➻ 25a² - 9b² - 4c² + 10ab - 12bc