Question

(iv) (За – 7b – с)²​

Answer 1

Answer:

(3a)^2 + (-7b)^2 + (-c) ^2 + 2(3a)(-7b) + 2(-7b)(-c) + 2(-c)(3a)

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