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secondary 2 | Maths
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Pls help me with this question. The question is to factorise the equation.
Pls reply asap . Thanks
Take out the common factor 2.
→ 2(9x² - y²)
Then, recall (a + b)(a - b) = a² - b²
Notice that 9x² = 3x × 3x = (3x)²
So it becomes 2(3x + y)(3x - y)
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