factorise: 25-(4a²+12a+9)
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Answer:
=25-4a^2-12a-9
=-4a^2-12a+16
=-4(a^2-3a-4)
=-4(a^2+a-4a-4)
=-4(a(a+1)-4(a+1)
=-4(a-4)(a+1)
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