33rd SSC CGL level Question Set, 9th on Algebra
This is the 33rd question set of 10 practice problem exercise for SSC CGL exam and 9th on topic Algebra.
For maximum gains, the test should be taken first, that is obvious. But more importantly, to absorb the concepts, techniques and deductive reasoning elaborated through the solutions, one must solve many problems in a systematic manner using the conceptual analytical approach.
Learning by doing is the best learning. There is no other alternative towards achieving excellence.
Before taking the test you may like to refer to our concept tutorials on Algebra and other related topics,
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33rd question set - 10 problems for SSC CGL exam: 9th on topic Algebra - answering time 15 mins
Q1. If $x = 2.361$, $y=3.263$, and $z=5.624$, then the value of $x^3 + y^3 - z^3 + 3xyz$ is,
- 35.621
- 1
- 0
- 19.277
Q2. If $6 + \displaystyle\frac{1}{x}=x$, then the value of $x^4 + \displaystyle\frac{1}{x^4}$ is,
- 1444
- 1442
- 1448
- 1446
Q3. If $x^2 + \displaystyle\frac{1}{x^2} = 66$, then the value of $\displaystyle\frac{x^2 - 1 + 2x}{x}$ is,
- $\pm{8}$
- $6, -10$
- $10, -6$
- $\pm{4}$
Q4. Find the minimum value of $2x^2 - (x - 3)(x + 5)$, where $x$ is real,
- 20
- 14
- -12
- 8
Q5. If $x+y=7$ then the value of $x^3 + y^3 + 21xy$ is,
- 243
- 143
- 443
- 343
Q6. If $x=\displaystyle\frac{\sqrt{3}}{2}$ then the value of $\displaystyle\frac{\sqrt{1+x} + \sqrt{1-x}}{\sqrt{1+x} - \sqrt{1-x}}$ will be,
- $-\sqrt{3}$
- $1$
- $\sqrt{3}$
- $-1$
Q7. If $p^3 + 3p^2 + 3p = 7$ then the value of $p^2 + 2p$ is,
- 3
- 4
- 5
- 6
Q8. If $\left(x + \displaystyle\frac{1}{x}\right)^2 = 3$ then the value of $(x^{72} + x^{66} + x^{54} + x^{36} + x^{24} + x^6 + 1)$ is,
- 4
- 2
- 3
- 1
Q9. If $a^2 + b^2 + c^2 = 2(a -b -c) -3$, then $4a - 3b + 5c$ is,
- 3
- 2
- 5
- 6
Q10. If $3x + \displaystyle\frac{1}{2x} = 5$, then the value of $8x^3 + \displaystyle\frac{1}{27x^3}$ is,
- $118\frac{1}{2}$
- $0$
- $30\frac{10}{27}$
- $1$
Solutions to the problems
For detailed conceptual solutions with answers you should refer to the companion SSC CGL level Solution Set 33 on Algebra where you will get detailed explanations on easiest path to the solutions.
Watch the quick mental solutions in the two-part video.
Part I: Q1 to Q5
Part II: Q6 to Q10
Additional help on SSC CGL Algebra
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