Obtenha a forma reduzida de cada equaçao e determine suas raizes:
a)x2-4x=5
b) (x+1).(x-2)=-7x-10
c)3x.(x-2)=2.(x+3/2)
a)x2-4x=5
b) (x+1).(x-2)=-7x-10
c)3x.(x-2)=2.(x+3/2)
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x2-2x+1x-2=7x-10
x2-2x+1x-7x-2+10=0
x2-9x+1x+8=0
x2-8x+8=0