Question

If x = 1/2-root3 then find the x³ - 2x² - 7x + 5​

Answer 1

Answer:

Now consider the given expression

x3−2x^2−7x+5=x3−7x−2x^2+5

⇒=x(x2−7)−2x^2+5

⇒=(2+3)(7+43−7)−2(7+43)+5

⇒=(2+3)(43)−14−83+5

⇒=83+12−14−83+5

⇒=3

x3−2x2−7x+5=m{Given}

∴m=3

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