2xsquare-21x-50 factorize
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2x²-21x-50=2x²+4x-25x-50=2x(x+2)-25(x+2)=2x-25 (x+2)=0
2x-25=0 x=25/2
x+2=0 x=-2
2x-25=0 x=25/2
x+2=0 x=-2
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