[tex](d-9)(d+2)-(d+5)(d-15)=d^{2}-7d-18-(d^{2}-10d-75)=\\\\=d^{2}-7d-18-d^{2}+10d+75=3d+57=3*(-0.14)+57=-0.42+57=56.58[/tex]
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[tex](d-9)(d+2)-(d+5)(d-15)=d^{2}-7d-18-(d^{2}-10d-75)=\\\\=d^{2}-7d-18-d^{2}+10d+75=3d+57=3*(-0.14)+57=-0.42+57=56.58[/tex]