Question

Think of the positive number , say x. From the square of this number subtract three times of itself. If the result is 10 find x

Answer 1

according to the question=>x^2-3x=10=>x^2-3x-10=0=>x^2-5x+2x-10=0=>x(x-5)+2(x-5)=0=>(x+2)(x-5)=0=>x=-2 and x=5..so x=5..as it is given in the question that x is positive no. so x=5(ans)