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TiliK225 [7]
3 years ago
6

(a+2b)² ?????????????????????​

Mathematics
1 answer:
lbvjy [14]3 years ago
3 0

Answer:

a² + 4ab + 4b²

Step-by-step explanation:

Given

(a + 2b)²

= (a + 2b)(a + 2b)

Each term in the second factor is multiplied by each term in the first factor, that is

a(a + 2b) + 2b(a + 2b) ← distribute both parenthesis

= a² + 2ab + 2ab + 4b² ← collect like terms

= a² + 4ab + 4b²

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The identity Sin(α)/Tan(α) = Cos(α) is valid

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Cosine Function:

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Lets prove this identity by proceeding with the LHS

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2 years ago
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yKpoI14uk [10]

Answer:

Step-by-step explanation:

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3 years ago
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aivan3 [116]

Answer:

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Step-by-step explanation:

I am assuming that by "sqrt(a)/sqrt(a)-2" you meant:

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----------

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To rationalize the denom., multiply numerator and denom. of this fraction by the conjugate of √a - 2, which is √a + 2:

√a(√a + 2)

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