6)5-x^2=1-x(x+8)
5-x^2=1-x^2-8x
x^2+x^2+8x=-4
x^2+4x=-2
x(x+4)=-2
x=-2
x2=-6
b) 4x-(5x+2)=3(1-2x)
4x-5x-2=3-6x
5x=5
x=1
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6)5-x^2=1-x(x+8)
5-x^2=1-x^2-8x
x^2+x^2+8x=-4
x^2+4x=-2
x(x+4)=-2
x=-2
x2=-6
b) 4x-(5x+2)=3(1-2x)
4x-5x-2=3-6x
5x=5
x=1