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=x²+5x+2x+10
=x²+7x+10 (jawabannya D)
2.(3x-5)²
=(3x-5) (3x-5)
=9x²-15x-15x+10
=9x²-30x+25 (jawabannya C)
3.(2x-1) (2x+1)
=4x²+2x-2x-1
=4x²-1 (jawabannya C)
4.2y²+6y
=2y(y+3) (jawabannya A)
5.2y²-5y-3
=(2y+1) ( y-3) (jawabannya A)