Find the solution set. x^2+2x−3=0 separate the two values with a comma.

Hello,

x²+2x-3=0
==>x²+3x-x-3=0
==>x(x+3)-1(x+3)=0
==>(x+3)(x-1)=0
==>x=-3 or x=1

Sol={-3,1}

x²-4x-5=0
==>x²+x-5x-5=0
==>x(x+1)-5(x+1)=0
==>(x+1)(x-5)=0
==>x=-1 or x=5

Sol={-1,5}

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats