Question

if x=1/3-root8, find the value of x^3-2^2-7x+5​

Answer 1

Answer:

$8.48$

Step-by-step explanation:

x=1/3-√8

ATQ

$x^3-2^2-7x+5​\\(\frac{1}{3}-\sqrt{8})^3(-2)^2-7(\frac{1}{3}-\sqrt{8})+5\\(\frac{1}{27}-\sqrt{512})+4-\frac{7}{3}+\sqrt{56}+5\\\\\frac{1}{27}-22.6+4-\frac{7}{3}+7.4+5$

$\frac{1-610.2}{27} +\frac{12-7+22.2+15}{3}\\\\\frac{-609.2}{27}+\frac{42.2}{3} \\ \\\frac{-609.2+379.8}{27} \\\\\frac{-229.2}{27}$

$Answer=8.48$

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