TEST YOURSELF! A. Which of these equations describe a quadratic equation? 1. A = πr²
2. x + 4x2 = 0
3. (x - 2)2 - 5 = 0
4. (x + 3) + 8 = 0
5. x2 = 0
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2. x + 4x2 = 0
3. (x - 2)2 - 5 = 0
4. (x + 3) + 8 = 0
5. x2 = 0
Welp me
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Answer:
3
Step-by-step explanation:
(x-2)² - 5 = 0
(x - 2)(x - 2) - 5 = 0
x² - 4x + 4 - 5 = 0
x² - 4x -1 = 0
format of a quadratic equation ax² + bx + c = 0