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oksano4ka [1.4K]
3 years ago
12

PLEASSSSEE HURRRRY HELLPP

Mathematics
1 answer:
antoniya [11.8K]3 years ago
6 0

Answer:

I believe your answer for 11. is B! And for 12 its E and C! 13 I think its D I'm not sure though!

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If x^2+2=3^2/3+3^-2/3 then prove that 3x^3+9x-8=0​
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Answer:

See below.

Step-by-step explanation:

x^2 + 2 = 3^2/3 + 3^-2/3

x^2 = 3^2/3 + 3^-2/3  - 2

x =  √(3^2/3 + 3^-2/3  - 2)

x = 0.748888296

Substitute for x  in  3x^3 + 9x - 8:

3( 0.748888296)^3 + 9( 0.748888296) - 8 = 0.

So it is proved.

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