Question

Qsimplify .(7m-3n-4k)²​

Answer 1

Answer:

Step-by-step explanation:

(7m-3n-4k)²

(7m-3n-4k)(7m-3n-4k)

49m²-21mn-28mk-21mn+9n²+12nk-28mk+12nk+16k²

=49m²+9n²+16n²-42mn-49mk+24nk

Answer 2

Answer ;;

49m² + 9n + 16k² - 42mn + 24nk - 56kn

Step-by-step explanation:

(7m - 3n - 4k)²​

⇒ (7m)² + (-3n)² + (-4k)² + 2 × (7m) × (-3n) + 2 × (-3n) × (-4k) + 2 × (-4k) × (7m)

⇒ 49m² + 9n + 16k² - 42mn + 24nk - 56kn

By using the formula ;;

(a + b + c) = a² + b² + c² + 2ab + 2bc + 2ac