factorise the question fast
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Answer:
5(2x+3)²-15(2x+3)
=(2x+3)[5(2x+3)-15]
=(2x+3)(10x+15-15)
=(2x+3)(10x)
=20x²+30x
OR
5(2x+3)²-15(2x+3)
=5(4x²+9+12x)-15(2x+3)
=20x²+45+60x-30x-45
=20x²+60x-30x+45-45
=20x²+30x
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