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GhostNinja18

  • 4 years ago

(2x-y)^3

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  1. GhostNinja18
    • 4 years ago
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    (2x+4z)^3

  2. Harkirat
    • 4 years ago
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    using the identity (A + B)^3 = A^3 + B^3 + 3A^2B + 3AB^2, U GET (2x+4z)^3 = (2x)^3 + (4z)^3 +3(2x)^2(4z) + 3(2x)(4z)^2 = 8x^3 + 64z^3 + 3(4x^2)(4z) + 3(2x)(16z^2) = 8x^3 + 64z^3 + 48x^2z + 96xz^2 I made a slight mistake in the first one so i am correcting and sending it after this

  3. GhostNinja18
    • 4 years ago
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    ok

  4. Harkirat
    • 4 years ago
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    using the identity (A - B)^3 = A^3 - B^3 -3A^2B + 3AB^2, U GET (2x-y)^3 = (2x)^3 - (y)^3 -3(2x)^2(y) + 3(2x)(y)^2 = 8x^3 - y^3 - 3(4x^2)(y) + 3(2x)(y^2) = 8x^3 - y^3 - 12x^2y + 6xy^2

  5. Harkirat
    • 4 years ago
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    now pls click the GOOD ANSWER button for both the answers :))

  6. GhostNinja18
    • 4 years ago
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    of course

  7. GhostNinja18
    • 4 years ago
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    you got the medal?

  8. Harkirat
    • 4 years ago
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    Yes, thank you !!

  9. GhostNinja18
    • 4 years ago
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    np

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