How to identify quadratic equations:
ax² + bx + cy² + dy + e= 0
4x2 + 4y2 = 36 is a circle because a=c. The a is 4 and the c is 4.
2x2 + 4y = 3 is a parabola because a or c equals 0.
4x2 - 4y2 = 12 is a hyperbola because a and c have different signs.
4x2 + 3y2 = 25 is an ellipse because a is not equal to c, and the signs are the same.
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