*Expand the given equation: (k + 7)³*
1️⃣ k³ + 21k² + 147k + 343
2️⃣ k³ + 3k² + 14k + 343
3️⃣ k³ + 343
4️⃣ None of these
Answers
Answered by
0
Answer:
none of these
(a+b)^3= a^3+b^3+3a^2b+3ab^2
Answered by
1
Answer:
(1) k³ + 21k² + 147k + 343
Step-by-step explanation:
(a + b)³ = a³ + 3a²b + 3ab² + b³
(k + 7)³ = k³ + 7³ + 3 × k × 7(k + 7)
(k + 7)³ = k³ + 7³ + 21k(k + 7)
= k³ + 7³ + 21k² + 147k
= k³ + 21k² + 147k + 343
Hope it helps :D
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