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CaHeK987 [17]
3 years ago
5

For what values of $x$ is $$\frac{x^2 + x + 3}{2x^2 + x - 6} \ge 0?$$ note: be thorough and explain why all points in your answe

r are solutions and why all points outside your answer are not solutions.

Mathematics
2 answers:
Rus_ich [418]3 years ago
5 0

To solve the inequality \frac{x^2+x+3}{2x^2+x-6}\ge \:0

\mathrm{Factor\:the\:left\:hand\:side\:}\frac{x^2+x+3}{2x^2+x-6}:

The numerator x^2+x+3 is not factorizable.

so factor the denominator 2x^2+x-6:

2x^2+x-6=\left(2x^2-3x\right)+\left(4x-6\right)=x\left(2x-3\right)+2\left(2x-3\right)\\ \mathrm{Factor\:out\:}x\mathrm{\:from\:}2x^2-3x\mathrm{:\quad }x\left(2x-3\right)\\ \mathrm{Factor\:out\:}2\mathrm{\:from\:}4x-6\mathrm{:\quad }2\left(2x-3\right)\\

Now take \mathrm{Factor\:out\:common\:term\:}\left(2x-3\right)

Then we get factor of the denominator as \left(2x-3\right)\left(x+2\right)

Thus \frac{x^2+x+3}{2x^2+x-6}=\frac{x^2+x+3}{\left(x+2\right)\left(2x-3\right)}

Now \mathrm{Compute\:the\:signs\:of\:the\:factors\:of\:}\frac{x^2+x+3}{\left(x+2\right)\left(2x-3\right)}\\

Signs of x^2+x+3>0

\mathrm{Choosing\:ranges\:that\:satisfy\:the\:required\:condition:}\:\ge \:\:0

x\frac{3}{2} is the required solution of the given inequality.

Anettt [7]3 years ago
3 0

Answer: (-\infty, -2)\cup(3/2,\infty)

Step-by-step explanation:

Here, the given expression,

\frac{x^2 + x + 3}{2x^2 + x - 6} \geq 0

Since, for the value of x,

Denominator ≠ 0,

2x^2+x-6\neq 0

\implies 2x^2+4x - 3x - 6\neq =0

\implies 2x(x+2)-3(x+2)\neq 0

\implies (2x-3)(x+2)\neq 0

\text{ if }2x-3\neq 0\implies x\neq \frac{3}{2}

\text{If } x+2\neq 0\implies x\neq -2

Thus, there is three intervals possible,

1) (-\infty,-2)

2) (-2,\frac{3}{2})

3) (\frac{3}{2},\infty)

In first intervals, \frac{x^2 + x + 3}{2x^2 + x - 6} \geq 0 is  true.

⇒ (-\infty,-2) will contain the value of x.

In second interval, \frac{x^2 + x + 3}{2x^2 + x - 6} \geq 0

is not true,

⇒ (-2, -\frac{3}{2}) will not contain the value of x,

In third interval,

In third interval, \frac{x^2 + x + 3}{2x^2 + x - 6} \geq 0

is true,

⇒ (-2, -\frac{3}{2}) will contain the value of x,

In third interval,

Thus, the value of x is,

(-\infty, -2)\cup(3/2,\infty)

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