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18 November, 16:41

Find the product of (3x+7y) ^2

A) 9x^2 - 42xy + 49y^2

B) 9x^2 - 49y^2

C) 9x^2 + 49y^2

D) 9x^2+42xy+49y^2

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Answers (2)
  1. 18 November, 16:44
    0
    (3x+7y) ² the form is ax² + 2ab + b² where a is 3x and B is 7y

    so its

    (3x) ² + 1 (3x) (7y) + (7y) ²

    9x² + 21xy + 49y²
  2. 18 November, 16:45
    0
    9x^2 - 42xy + 49y^2
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