IS THE FORMULA EFFECTIVE? Find the solutions of each of the following quadratic equations using quadratic formula.
1.) x² + 10x + 9 = 0

2.) x² 12x +35 = 0

3.) x2 + 5x - 14 = 0

4.) x² - 4x + 12 = 0

5.) x² + 7x = 4

6.)2x² + 7x +9=0 7.4x² - 4x + 1 = 0

8.)3x² - 4x = 0

9.)9x² - 72 = 0

10.) 2x² + 4x = 3

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