Let the domains of the functions f(x) = log_4 | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) For $f(x)$,we require $\log_3 \log_7(8 - \log_2(x^2 + 4x + 5)) > 0$. This implies $\log_7(8 - \log_2(x^2 + 4x + 5)) > 1$,so $8 - \log_2(x^2 + 4x +

Vedclass · Accepted Answer

$15$

Vedclass · Answer

(A) For $f(x)$,we require $\log_3 \log_7(8 - \log_2(x^2 + 4x + 5)) > 0$. This implies $\log_7(8 - \log_2(x^2 + 4x + 5)) > 1$,so $8 - \log_2(x^2 + 4x + 5) > 7$. Thus,$\log_2(x^2 + 4x + 5) Factoring gives $(x + 3)(x + 1) For $g(x)$,we require $-1 \leq \frac{7x + 10}{x - 2} \leq 1$. Solving $\frac{7x + 10}{x - 2} \leq 1$ $\Rightarrow \frac{7x + 10 - x + 2}{x - 2} \leq 0$ $\Rightarrow \frac{6x + 12}{x - 2} \leq 0$ $\Rightarrow \frac{x + 2}{x - 2} \leq 0$,so $x \in [-2, 2)$. Solving $\frac{7x + 10}{x - 2} \geq -1$ $\Rightarrow \frac{7x + 10 + x - 2}{x - 2} \geq 0$ $\Rightarrow \frac{8x + 8}{x - 2} \geq 0$ $\Rightarrow \frac{x + 1}{x - 2} \geq 0$,so $x \in (-\infty, -1] \cup (2, \infty)$. The intersection is $x \in [-2, -1]$. Thus,$\gamma = -2$ and $\delta = -1$. Finally,$\alpha^2 + \beta^2 + \gamma^2 + \delta^2 = (-3)^2 + (-1)^2 + (-2)^2 + (-1)^2 = 9 + 1 + 4 + 1 = 15$.

Let the domains of the functions $f(x) = \log_4 \log_3 \log_7(8 - \log_2(x^2 + 4x + 5))$ and $g(x) = \sin^{-1}(\frac{7x + 10}{x - 2})$ be $(\alpha, \beta)$ and $[\gamma, \delta]$,respectively. Then $\alpha^2 + \beta^2 + \gamma^2 + \delta^2$ is equal to:

Similar Questions

If $f:[2,3] \rightarrow R$ is defined by $f(x)=x^3+3x-2$,then the range of $f(x)$ is contained in the interval

The domain of the function $f(x) = \sec^{-1}(3x - 4) + \tanh^{-1}\left(\frac{x + 3}{5}\right)$ is

The domain and range of a real valued function $f(x) = \cos x - 3$ are respectively.

The range of the real valued function $f(x) = \frac{x^2 + 2x - 15}{2x^2 + 13x + 15}$ is

The domain of the function $f(x) = \sqrt{x - x^2} + \sqrt{4 + x} + \sqrt{4 - x}$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module