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18 October, 16:55

Find the missing terms in the equation so that it is true. (3x + ?) ^2=9x^2 + ? + 49y^2

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  1. 18 October, 19:29
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    see explanation

    Step-by-step explanation:

    Note that 9x² and 49y² are perfect squares.

    9x² = (3x) ² → 3x is the first term

    49y² = (7y) ² → 7y is the second term

    Hence

    (3x + 7y) ² = 9x² + 42xy + 49y²
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