Question

2x^ - 9x +4=0
( ^ esse símbolo significa ao quadrado)

Answer 1

$2x ^{2} - 9x + 4 = 0 \\ delta = b ^{2} - 4ac \\ ( - 9) ^{2} - 4 \times 2 \times 4 \\ 81 - 32 \\ 49 \\ x = - b \binom{ + }{ - } \sqrt[2]{delta} \div 2 \times a \\ x = - ( - 9) \frac{ + }{ - } \sqrt{49 } \div 2 \times 2\\ x1 = 9 + 7 \div 4 \\ x1 = 16 \div 4 \\ x1 = 4 \\ x2 = 9 - 7 \div 4 \\ x2 = 2 \div 4 \\ x2 = \frac{1}{2}$