Question

factorise 4x²-y²+6y-9​

Answer 1

Answer:

4x²-y²+6y-9

=(2x)² - (y²-6y+9)

=(2x)²-{(y)²-2.y.3+(3)²}

=(2x)²-(y-3)² [(a-b)² = a²+b²-2ab]

=(2x+y-3)(2x-y+3) [a²-b² = (a+b)(a-b) ]

Step-by-step explanation:

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