factorise : 25x² - 4y²- 9 + 12y
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Answer:
(-5x + 2y - 3z) (-5x+2y-3z)
Step-by-step explanation:
Using identity (a + b + c)² we can solve
this
( -5x)² + (2y)² + (-3z)² + 2 × (-5x)(2y) + 2 x 2y x (-3z) + 2 (-3z) ( -5x)
= (-5x+2y-3z)²
= (-5x + 2y - 3z) (-5x + 2y - 3z)
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