Question

Quadratic Equations
3x - 5x2 + 12 has maximum at x = a, then a is ???
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Answer 1

1. Your answer is a = 12/7
2. $3x - 5x2 + 12 = 0$
3. $3(a) - 5(a)2 + 12 = 0$
4. $3a - 10a + 12 = 0$
5. $- 7a = - 12$
6. $a = 12 \div 7$