Question

9. (a+b+c)² - (a – b – c)² is equal to *​

Answer 1

Answer:

zero

Step-by-step explanation:

Answer 2

Answer:

4a(b+c)

Step-by-step explanation:

${a}^{2} - {b}^{2} = (a + b)(a - b)$

so, by above formula

(a+b+c+a-b-c)(a+b+c-a+b+c)

=(2a)(2b+2c)

=4(ab+ac)