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trapecia [35]
3 years ago
5

Help plsss

Mathematics
1 answer:
LenKa [72]3 years ago
8 0
<h3></h3><h2>⭐ Development:</h2><h3></h3>

  • Having the expression, let's modify it so it becomes a 2nd degree equation:

\large {\text {$ \sf \cfrac{1}{2x^2} -2 = 0 $}}

  • Now, we will multiply per 2x² both sides of equation...

\large {\text {$ \sf \cfrac{1}{2x^2}\cdot \:2x^2-2\cdot \:2x^2=0\cdot \:2x^2 $}

                 \searrow

                     \large {\text {$ \sf 1-4x^2=0$}}

  • We have to write in standard form...

\large {\text {$ \sf -4x^2+1 = 0 $}}

<u>                                                                                                      </u>

<u />

\large {\text{$\sf x=\cfrac{-b\pm\sqrt{b^2-4ac}}{2a} \quad\rightarrow\quad x=\cfrac{-0\pm\sqrt{0^2-4\cdot (-4) \cdot1} }{2\cdot (-4) } \:\rightarrow\:\: x=\cfrac{-0^2 \pm4}{2 \cdot(-4)}    $}}  

                                                                                                                         

                                                             \huge {\text {$ \sf \downarrow$}}

                                                                                                         

           \large {\text {$\sf {\bf x_1} = \cfrac{-0+4}{2\left(-4\right)}= \cfrac{-1}{2}  $}}                        \large {\text {$\sf {\bf x_2 }=\cfrac{-0-4}{2\left(-4\right)} = \cfrac{1}{2}  $}}

  • At this point, we're going to add the values ​​of x₁ and x₂:

\large {\boxed {\boxed { \bf x_1 + x_2=  -\cfrac{1}{2}+ \cfrac{1}{2} = 0}  }}

                                           \huge {\text {$ \it  Alternative \: A $}}

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Option B:

9^{\frac{1}{8}x} is the equivalent expression to the given expression.

Solution:

Given expression:

$\sqrt[4]{9} ^{\frac{1}{2}x}

To find the equivalent expression to the given expression.

$\sqrt[4]{9} ^{\frac{1}{2}x}

Using radical rule: $\sqrt[n]{a}=a^{\frac{1}{n}}

So that $\sqrt[4]{9} = 9^{\frac{1}{4} }.

$\sqrt[4]{9} ^{\frac{1}{2}x}=\left(9^{\frac{1}{4}}\right)^{\frac{1}{2} x}

Using exponent rule: \left(a^{b}\right)^{c}=a^{b c}

         =9^{\frac{1}{4} \cdot \frac{1}{2} x}

         =9^{\frac{1}{8}x}

$\sqrt[4]{9} ^{\frac{1}{2}x}=9^{\frac{1}{8}x}

Hence 9^{\frac{1}{8}x} is the equivalent expression to the given expression.

Option B is the correct answer.

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Step-by-step explanation:

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Hope this helps.
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