Practice problem
Which of the equations is quadratic?
x4+x3+x2+1=0x^4 +x^3 +x^2 + 1=0x4+x3+x2+1=0
x3+x2+x+1=0x^3 +x^2+x +1=0x3+x2+x+1=0
x2+x+1=0x^2+x +1=0x2+x+1=0
x+1=0x +1=0x+1=0
Type a concept, like “slope” or “photosynthesis”.
