Question

${3a}^{2} - {2b}^{2} + 4c$
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Answer 1

3a² - 2b² + 4c

3 × 2² - 2 × (-3)² + 4 × 5

3 × 4 - 2 × 9 + 4 × 5

12 - 18 + 20

12 + 2

14