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- Standard form is ' -5x^3+4x^2+7x-4'
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please mark me brainlist answer..i need it.
Identity:
An identity is an equality which is true for all values of a variable in the equality.
(a + b + c)² = a² + b² + c² + 2ab + 2bc + 2ca
In an identity the right hand side expression is called expanded form of the left hand side expression.
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Solution:
i)
(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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