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21 July, 23:14

A^2-8ab+16b^2=81, find a-4b

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  1. 21 July, 23:26
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    -9, 9

    Step-by-step explanation:

    a² - 8ab + 16b² = 81

    (a - 4b) ² = 81 Wrote the left-hand side as a square

    a - 4b = ±9 Took the square root of each side

    All values of a - 4b are - 9 and + 9.
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