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10. Find the range of values of \( k \) for which the equation \( 3 x^{2}-7 x+k=0 \) has no real roots.

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Answer:

To find the range of values of k for which the equation \(3x^2 - 7x + k = 0\) has no real roots we can examine the discriminant of the quadratic equation.

The discriminant (\(\Delta\)) of a quadratic equation \(ax^2 + bx + c = 0\) is given by the formula \(\Delta = b^2 - 4ac\).

In our given equation \(3x^2 - 7x + k = 0\ the coefficients are: a = 3 b = -7 and c = k.

Using the quadratic formula the solutions to the equation are given by:

\[x = \frac{-b \pm \sqrt{\Delta}}{2a}\]

For the equation to have no real roots the discriminant must be negative (\(\Delta < 0\)). So we have:

\[b^2 - 4ac < 0\]

\[(-7)^2 - 4 \cdot 3 \cdot k < 0\]

\[49 - 12k < 0\]

\[12k > 49\]

\[k > \frac{49}{12}\]

Therefore the range of values for k that makes the equation \(3x^2 - 7x + k = 0\) have no real roots is \(k > \frac{49}{12}\).

User Viktor Klang
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