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Factorise: 12x + 15

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(4x + 5)

3(4x + 5)

4(3x + 5)

3(3x + 6)

answer is B.

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Detailed Solution

Given: 12x + 15

12x = 2 × 2 × 3 × x

15 = 3 × 5

The common factor in the given two terms is 3.

∴ 12x + 15 = (2 × 2 × 3 × x) + (3 × 5)

= 3(4x + 5)

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