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Chapter 5 of 28
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Factorisation

ICSE · Class 9 · Mathematics

Flashcards for Factorisation — ICSE Class 9 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.

41 questions24 flashcards5 concepts

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A visual representation showing a polynomial being expressed as a product of its factors, illustrating that factorisation is the reverse of multiplication.
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24 Flashcards
Card 1Common Factor Method

Solve by common factor method: 6a^2 - 3ax

Answer

Step 1: Find the H.C.F. of 6a^2 and -3ax. It is 3a. Step 2: Divide each term by 3a. 6a^2 ÷ 3a = 2a -3ax ÷ 3a = -x Step 3: Write the expression in brackets. 6a^2 - 3ax = 3a(2a - x) Answer: 3a(2a - x)

Card 2Common Factor Method

Factorise: 8ab^2 + 12a^2b

Answer

Step 1: Find the H.C.F. of both terms. H.C.F. = 4ab Step 2: Divide each term by 4ab. 8ab^2 ÷ 4ab = 2b 12a^2b ÷ 4ab = 3a Step 3: Write the factorised form. 8ab^2 + 12a^2b = 4ab(2b + 3a) Answer: 4ab(2b

Card 3Common Factor Method

Factorise: 4(x + y)^2 - 3(x + y)

Answer

Step 1: Notice that (x + y) is common. Step 2: Take (x + y) outside the bracket. 4(x + y)^2 - 3(x + y) = (x + y)[4(x + y) - 3] Step 3: Simplify the bracket. = (x + y)(4x + 4y - 3) Answer: (x + y)(4x +

Card 4Common Factor Method

Factorise: x(a - 5) + y(5 - a)

Answer

Step 1: Rewrite 5 - a as -(a - 5). So, y(5 - a) = -y(a - 5) Step 2: Now the expression becomes x(a - 5) - y(a - 5) Step 3: Take (a - 5) common. = (a - 5)(x - y) Answer: (a - 5)(x - y)

Card 5Grouping Method

Solve by grouping: ab + bc + ax + cx

Answer

Step 1: Group the terms. (ab + bc) + (ax + cx) Step 2: Take common factors from each group. b(a + c) + x(a + c) Step 3: Take the common bracket. = (a + c)(b + x) Answer: (a + c)(b + x)

Card 6Grouping Method

Factorise by grouping: ab^2 - (a - 1)b - 1

Answer

Step 1: Expand the middle term. ab^2 - (a - 1)b - 1 = ab^2 - ab + b - 1 Step 2: Group the terms. (ab^2 - ab) + (b - 1) Step 3: Take common factors. ab(b - 1) + 1(b - 1) Step 4: Take the common bracket

Card 7Trinomial Splitting the Middle Term

Factorise: x^2 + 5x + 6

Answer

Step 1: Split 5 into 3 and 2 because 3 + 2 = 5 and 3 × 2 = 6. Step 2: Rewrite the middle term. x^2 + 3x + 2x + 6 Step 3: Group the terms. x(x + 3) + 2(x + 3) Step 4: Take the common bracket. = (x + 3)

Card 8Trinomial Splitting the Middle Term

Factorise: x^2 - 5x + 6

Answer

Step 1: Split -5 into -3 and -2 because -3 + -2 = -5 and (-3)(-2) = 6. Step 2: Rewrite the middle term. x^2 - 3x - 2x + 6 Step 3: Group the terms. x(x - 3) - 2(x - 3) Step 4: Take the common bracket.

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Frequently Asked Questions

What are the important topics in Factorisation for ICSE Class 9 Mathematics?
Factorisation covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Factorisation — ICSE Class 9 Mathematics?
Understand the core concepts first, then work through the 41 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Factorisation?
There are 24 flashcards for Factorisation covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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