Question

resolva a equação do segundo grau

me ajudem pfvr ​

Answer 1

4x²-12x+7 = 0

Δ = b²-4×a×c

Δ = 12²-4×4×7

Δ = 144-4×4×7

Δ = 144-16×7

Δ = 144-112

Δ = 32

$\\ x = \frac{ - b \frac{ + }{} \sqrt{Δ } }{2 \times a} = \frac{ - ( - 12) \frac{ + }{} \sqrt{32} }{2 \times 4} = \\ \frac{12 \frac{ + }{} 5,6568542495 }{8} = \\ \\ \\ x = \frac{12 + 5,6568542495}{8} = \frac{17,6568542495}{8} \\ x= 2,2071067812 \\ \\ \\ x = \frac{12 - 5,6568542495}{8} = \frac{6,3431457505}{8} \\x = 0,7928932188$

x={2,2071067812; 0,7928932188}