Hi,

solve









x(x+9) = 10^1

x^2 + 9x = 10

x^2 + 9x - 10 = 0

factoring

(x+ 10)(x-1)=0

(x+10) = 0  

x = -10 This is an Extraneous solution

(x-1)= 0

x = 1 

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