# Algebra – Grade 9 ICSE

There are few topics covered in this section:

1. Expansion and Factorization
2. Changing the subject of a formula
3. Linear Equations and Simultaneous Equations
4. Indices/ Exponents
5. Logarithms

Click on each topic to know more details.

Expansion and Factorization
Expansion – key topics include:
• (a ± b)2
• (a ± b)3
• (x ± a)(x ± b)
Factorization – key topics include:
• a2 – b2
• a3 ± b3
• ax2 + bx + c, by splitting the middle term

Changing the subject of a formula
Key topics include:
• Concept that each formula is a perfect equation with variables
• Concept of expressing one variable in terms, of another various operators on terms transposing the terms squaring or taking square root, etc

Linear Equations and Simultaneous Equations
Key topics include:
• Solving algebraically (by elimination as well as substitution) and graphically
• Solving simple problems based on these by framing appropriate formulae
Indices/ Exponents
Key topics include:
• Handling positive, fractional, negative and “zero” indices
• Simplification of expressions involving various exponents; use of laws of exponents

Logarithms
Key topics include:
• Logarithmic form vis-à-vis exponential form: interchanging
• Laws of Logarithms and its use
• Expansion of expression with the help of laws of logarithm

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