\[\begin{array}{cc} {\textbf{Quadratic equation}}&{\textbf{Quadratic equation in two variable}}\\ {}&{y=x^2−2x−15}\\ {x^2−2x−15}&{\text{Let} y=0, 0=x^2−2x−15}\\ {(x−5)(x+3)=0}&{0=(x−5)(x+3)}\\ {x−5=0,...Quadratic equationQuadratic equation in two variabley=x2−2x−15x2−2x−15Lety=0,0=x2−2x−15(x−5)(x+3)=00=(x−5)(x+3)x−5=0,x+3=0x−5=0,x+3=0x=5,x=−3x=5,x=−3(5,0)and(−3,0)x-intercepts
