Find the point on the plane x - y + z = 4 that is closest to the point (1, 2, 3). (give your values correct to at least two decimal places.)

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-2

7 - 9 = -2

reversed:

-2 + 9 = 7

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11