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2 September, 23:36

What is the value of 5x³+4y³ when x=4 and y=3

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  1. 3 September, 01:07
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    Answer: 428

    Step-by-step explanation:

    This is a substitution problems,

    Just substitute for the values of x and y, multiply them out and add.

    Here we go;

    5x³ + 4y³

    = 5 (4³) + 4 (3³)

    = 5 (4 x 4 x 4) + 4 (3 x 3 x 3)

    = 5 x 64 + 4 x 27

    = 320 + 108 add directly or find the common factor

    = 4 (80 + 27)

    = 4 (107)

    = 4 x 107

    = 428
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