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dmitriy555 [2]
3 years ago
12

What are the solutions of the equation 9x^4 – 2x^2 – 7 = 0? Use u substitution to solve.

Mathematics
1 answer:
Debora [2.8K]3 years ago
8 0
9x^4 - 2x^2 - 7 = 0 \\ \text{substitution: }  x^2=t, \ \ t\ \textgreater \ 0\\ 9t^2-2t-7\ \textgreater \ 0 \\ D=b^2-4ac=(-2)^2-4*9*(-7)=4+252 = 256 \\ t_{1,2}= \frac{-bб \sqrt{D} }{2a}= \frac{2б 16 }{18} \\ t_1=- \frac{14}{18} \ \ \ \ \O \\  \boxed{t_2=1} \\ \\x^2=1\\x=б \sqrt{1} \\ x=б1

Answer: x=-1, x=1
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Answer:

<u>The original price of the belt was $ 59.32 and Jonathan paid $ 35 for it.</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

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Discount = 1/3 off the regular price

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2. How much did the Gucci belt cost Jonathan? Show your work or explain how you know.

We assume the question is asking for the original price of the belt, then we make this calculation:

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Replacing with the values we know:

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Step-by-step explanation:

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