Solve the Quadratic Inequality: Where f(x)=-2x²+4x-6 Is Greater Than 0

The following function is graphed below:

f(x)=2x2+4x6 f(x)=-2x^2+4x-6

For which values of x is

f(x)>0 f(x)>0 true?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the domain of positivity of the function
00:03 The domain of positivity is above the X-axis
00:06 The entire function is below the X-axis
00:09 Therefore it is never positive
00:12 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

The following function is graphed below:

f(x)=2x2+4x6 f(x)=-2x^2+4x-6

For which values of x is

f(x)>0 f(x)>0 true?

2

Step-by-step solution

The given function is f(x)=2x2+4x6 f(x) = -2x^2 + 4x - 6 .

First, we find the roots of the equation f(x)=0 f(x) = 0 , which are the critical points where the function can change its sign.

Using the quadratic formula x=b±b24ac2a x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} , where a=2 a = -2 , b=4 b = 4 , and c=6 c = -6 :

Calculate the discriminant Δ=b24ac=424(2)(6)=1648=32\Delta = b^2 - 4ac = 4^2 - 4(-2)(-6) = 16 - 48 = -32.

The discriminant is negative, indicating there are no real roots.

Because the parabola opens downwards and there are no x-intercepts (real roots), the function does not cross the x-axis.

Hence, for all real numbers, f(x)0 f(x) \leq 0 .

Therefore, there are no values of x x for which f(x)>0 f(x) > 0 .

Thus, the solution is: No answer.

3

Final Answer

No answer

Practice Quiz

Test your knowledge with interactive questions

The graph of the function below intersects the X-axis at points A and B.

The vertex of the parabola is marked at point C.

Find all values of \( x \) where \( f\left(x\right) > 0 \).

AAABBBCCCX

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