5 questions from 2026
If the domain of the function \( f(x)=\log_{(10x^{2}-17x+7)}(18x^{2}-11x+1) \) is \( (-\infty,a)\cup(b,c)\cup(d,\infty)-\{e\} \), then \( 90(a+b+c+d+e) \) equals:
If the set of all solutions of \( |x^{2}+x-9| = |x| + |x^{2}-9| \) is \([\alpha,\beta] \cup [\gamma,\infty)\), then \( (\alpha^{2}+\beta^{2}+\gamma^{2}) \) is equal to:
Let \( S \) be the set of the first \( 11 \) natural numbers. Then the number of elements in \( A = \{ B \subseteq S : n(B) \ge 2 \text{ and the product of all elements of } B \text{ is even} \} \) is ________ .
Let \( S = \left\{ x^{3} + a x^{2} + b x + c : a,b,c \in \mathbb{N} \ \text{and} \ a,b,c \leq 20 \right\} \) be a set of polynomials. Then the number of polynomials in \( S \), which are divisible by \( x^{2} + 2 \), is:
The sum of squares of all the real solutions of the equation \( \log_{(x+1)}(2x^2+5x+3)=4-\log_{(2x+3)}(x^2+2x+1) \) is equal to \( \_\_\_\_\_ \).
