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leva [86]
2 years ago
6

Determine the solution for the following equation:

%3D64" id="TexFormula1" title="(8x-8)^{\frac{3}{2} }=64" alt="(8x-8)^{\frac{3}{2} }=64" align="absmiddle" class="latex-formula">
a - x=3
b - x=5
c - 13
d - 65
Mathematics
1 answer:
adell [148]2 years ago
8 0

Answer:

\text{A. }x=3

Step-by-step explanation:

Recall the exponent property a^{b^c}=a^{(b\cdot c)}. Therefore, we can square both sides of the equation to get rid of the fraction in the exponent:

((8x-8)^{\frac{3}{2}})^2=64^2,\\(8x-8)^{\frac{3}{2}\cdot2}=64^2,\\(8x-8)^3=4096

Take the cube root of both sides:

8x-8=16

Add 8 to both sides:

8x=24

Divide both sides by 8 to isolate x:

x=\frac{24}{8}=\boxed{3}

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8 0
3 years ago
<img src="https://tex.z-dn.net/?f=y%20%3D%20x%20%7B%7D%5E%7B2%7D%20-%209x%20%2B%2014" id="TexFormula1" title="y = x {}^{2} - 9x
svetoff [14.1K]

Answer:

a = - \frac{9}{2} , b = - \frac{25}{4}

Step-by-step explanation:

To obtain the required form use the method of completing the square

add/ subtract ( half the coefficient of the x- term)² to x² - 9x

y = x² + 2(- \frac{9}{2} )x + \frac{81}{4} - \frac{81}{4} + 14

  = (x - \frac{9}{2} )² - \frac{81}{4} + \frac{56}{4}

  = (x - \frac{9}{2} )²- \frac{25}{4} ← in the form (x + a)² + b

with a = - \frac{9}{2} and b = - \frac{25}{4}

8 0
3 years ago
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