Question

expand (7m-3n-4k)2 ​

Answer 1

Answer:

7m -3n -4k×2

Step-by-step explanation:

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Answer 2

Answer:

Let us expand the given expression:

(7m – 3n – 4k)2 = (7m)2 +(- 3n)2 +(- 4k)2 + [2 ×(7m)×(-3n)] + [2 ×(-3n)×(-4k)] + [2 × (7m)×(-4k)]

By using the formula,

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

Here, a = 7m, b = -3n, c = -4k

Now, substitute the value we get

= 49m2 + 9n2 + 16k2 + [– 42mn] + [24nk] + [– 56mk]

= 49m2 + 9n2 + 16k2 – 42mn + 24nk – 56mk

∴ (7m – 3n – 4k)2 = 49m2 + 9n2 + 16k2 – 42mn + 24nk – 56mk