Solution equation: - X & # 178; + 2x + 7 = 0

Solution equation: - X & # 178; + 2x + 7 = 0

transposition
x²-2x=7
x²-2x+1=7+1
(x-1)²=8
x-1=±2√2
x=1-2√2,x=1+2√2