Check your Understanding Solve the following quadratic equations by using an appropriate method. 1. 2 − − 2 = 0 6. 2 − 14 = −15 2. 4 2 − 20 = 0 7. 4( − 1) 2 = 15 3. 2 2 + 7 = 9 8. 2 +8 = 20 4. 2 = 72 9. 2 + 1 4 = 1 4 5. 2 = 45 + 12 10. ( +2) 2 − 2( − 3) = 10
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