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9x*x+25y*y+15x*y+12x-20y+16*3x-5y-4
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1.add or subtract.
(4x²+15x-3)-(-3x²+5) A:7x²+15x-8*** B:x²+12x+2 C:x²+15x-8 D:7x²+8 2.Simplify the polynomial.
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4(x+3)=24 4(3x)=24 12x=24 12x/12= 24/12 X=2 5(x+2)=45 5x+10=45 15x=45 15x/15=45/15 x=3 5+4x=13