SSC CGL Maths Chapter 3: Indices and Surds: Mastering Indices and Surds is essential for scoring high in the SSC CGL exam. Though it might seem tricky at first, this chapter becomes super easy once you understand the rules and practice with the right approach. In this post, we’ll cover the basic concepts, shortcut tricks, key formulas, and practice examples that will make solving these questions a breeze!
Meaning of Indices (Powers)
Laws of Indices with Examples
Understanding Surds (Irrational Roots)
Simplifying Surds Easily
SSC CGL Exam Patterns
Practice Questions with Short Tricks
Indices (also called powers or exponents) represent how many times a number is multiplied by itself.
📌 Example:
23=2×2×2=82^3 = 2 \times 2 \times 2 = 8
A surd is an irrational number which cannot be simplified to remove the root.
📌 Example:
2,3,5\sqrt{2}, \sqrt{3}, \sqrt{5} are surds because they can’t be expressed as exact fractions.
| Law | Rule | Example |
|---|---|---|
| 1 | am×an=am+na^m \times a^n = a^{m+n} | 23×22=25=322^3 \times 2^2 = 2^5 = 32 |
| 2 | aman=am−n\frac{a^m}{a^n} = a^{m-n} | 54/52=52=255^4 / 5^2 = 5^2 = 25 |
| 3 | (am)n=amn(a^m)^n = a^{mn} | (32)3=36=729(3^2)^3 = 3^6 = 729 |
| 4 | a0=1a^0 = 1 | 70=17^0 = 1 |
| 5 | a−n=1/ana^{-n} = 1/a^n | 2−3=1/82^{-3} = 1/8 |
a×b=a×b\sqrt{a \times b} = \sqrt{a} \times \sqrt{b}
ab=a/b\frac{\sqrt{a}}{\sqrt{b}} = \sqrt{a/b}
Multiply and rationalize the denominator using conjugates if needed.
📌 Example:
50=25×2=52\sqrt{50} = \sqrt{25 \times 2} = 5\sqrt{2}
✅ Learn the Laws by Heart – They save time in every question
✅ Practice Simplification Daily – Especially with surds like 72\sqrt{72}
✅ Remember Common Surd Values – Like 2≈1.41\sqrt{2} \approx 1.41, 3≈1.73\sqrt{3} \approx 1.73
🟢 Answer: 23+4=27=1282^{3+4} = 2^7 = 128
🟢 Answer: 32×3=36=7293^{2 \times 3} = 3^6 = 729
🟢 Answer: 36×2=62\sqrt{36 \times 2} = 6\sqrt{2}
SSC CGL Maths Chapter 3, Indices and Surds Tricks, Laws of Indices, Simplifying Surds, SSC CGL Preparation, Free SSC Maths eBook
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