Escreva as equações na forma geral e resolva
A) -20=-x-x²
B) 13-2x-15x²=0
Soluções para a tarefa
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A) -20=-x-x^2》-x^2-x+20=0(-1)》x^2+x-20=0》a=1,b=1,c=-20》x=-1+,-\/1^2-4(1)(-20)/2(1)》x=-1+,-\1+80/2》x=-1+,-\/81/2》x=-1+,-9/2》x1=-1+9/3》x1=8/2》x1=4》x2=-1-9/2》x2=-10/2》x2=-5............ B)13-3c-15x^2=0》-15x^2-2x+13=0 (-1)》15x^2+2x-13=0》a=15,b=2,c=-13》x=-2+,-\/2^2-4(15)(-13)/2(15)》x=-2+,-\/4-60(-13)/30》x<;2+,-\/4+780/30》x=-2+,-\/784/30》x=-2+,-28/30》x1=-2+28/30》x1=26/30(÷2)》x1=13/15》x2=-2-28/30》x2=-30/30》x2=-1
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