Practice problem
Which of the following polynomials are quadratic?
2x2+6x+42x^{2}+6x+42x2+6x+4
x2x^{2}x2
9x2+59x^{2}+59x2+5
3x2+9x+13x^{2}+9x+13x2+9x+1
Type a concept, like “slope” or “photosynthesis”.
