Question

x(x+2)+(x-1)=9

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Answer 1

x(x+2)+(x-1)=9
x²+2x+x-1=9
x²+3x-10=0
x=-3+-√3²-4.1.(-10)/2
x=-3+-√49/2
x=-3+-7/2
x'=2
x''=-5