Question
Factorise the following by grouping the terms$:15xy - 9x - 25y + 15$
✓
Answer
$15xy - 9x - 25y + 15$
$= (15xy - 9x) - (25y + 15)$
$= 3x(5y - 3) - 5(5y - 3)$
$= (5y - 3)(3x - 5).$
$= (15xy - 9x) - (25y + 15)$
$= 3x(5y - 3) - 5(5y - 3)$
$= (5y - 3)(3x - 5).$
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