(i) (x + 2y + 4z) expand using suitable identities
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Step-by-step explanation:
(x + 2y + 4z)²
Using identity,
(a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca
Here, a = x, b = 2y and c = 4z
(x + 2y + 4z)²
= x² + (2y)² + (4z)²² + (2×x×2y) + (2×2y×4z) + (2×4z×x)
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