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Value of a near-cube polynomial in x and y at given x, y

The same question, asked 3 times: 14 Jul 2023 S2*, 21 Jul 2023 S2*, 21 Jul 2023 S4. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    14 Jul 2023 S2

    56
    What is the value of 64x3+38x2y+20xy2+y364x^3 + 38x^2y + 20xy^2 + y^3, when x=3x = 3 and y=−4y = -4?

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  2. Question 2

    21 Jul 2023 S2

    74
    What is the value of (27x3+58x2y+31xy2+8y3)(27x^3 + 58x^2y + 31xy^2 + 8y^3), when x=5x = 5 and y=−7y = -7?

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  3. Question 3

    21 Jul 2023 S4

    69
    What is the value of 64x3+36x2y+24xy2+2y364x^3 + 36x^2y + 24xy^2 + 2y^3, when x=3x = 3 and y=−4y = -4?

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