1. Which of the given mathematical sentences on the preceding section are quadratic equations? a2 - 2a + 5 = 0, z? - 5z - 6 = 0 2. How do you describe quadratic equations? Which of the given mathematical sentences are not quadratic equations? 2y2 + 5y - 3 20 m2 + 2m + 4 = -2 p2 - 5p - 650 s2 - 3s - 750 c2 +6C + 8 > 0 - 4. How would you describe mathematical sentences which are not quadratic equations? 5. How do they differ from those equations which are quadratic equations?



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