Question

(7m-3n-4k) the whole square​

Answer 1

Answer:

49m²+9n²+16k²-42mn-24kn-56km

Step-by-step explanation:

(7m-3n-4k)²

(a+b+c)²=a²+b²+c²+2ab+2bc+2ac

(7m-3n-4k)²=(7m)²+(-3n)²+(-4k)²+2(7m)(-3n)+2(-3n)(-4k)+2(-4k)(7m)

49m²+9n²+16k²-42mn+24kn-56km