The wind blew away 28 of your muffins. that was 2 3ds of all of them how many se left?

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Ответ:

JustinLaucirica

12.04.2022

Mathematics

x = - 3 ± 3 $\sqrt{10}$

Step-by-step explanation:

x² + 6x = 81

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(3)x + 9 = 81 + 9

(x + 3)² = 90 ( take square root of both sides )

x + 3 = ± $\sqrt{90}$ = ± 3 $\sqrt{10}$ ( subtract 3 from both sides )

x = - 3 ± 3 $\sqrt{10}$ , then

x = - 3 - 3 $\sqrt{10}$ , x = - 3 + 3 $\sqrt{10}$

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