factorise :(2x+1)²-9x²
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3
Answer:
4x²+1+4x-9x²
= 1+4x-5x²
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(2x + 1)² - 9x²
= (2x + 1)² - (3x)²
= (2x + 1 + 3x)(2x + 1 - 3x)
= (5x + 1)(-x + 1)
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