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(x−6)2−18=0\left(x-6\right)^2-18=0(x−6)2−18=0 의 근은?
x=−6±32x=-6\pm3\sqrt[]{2}x=−6±32
x=6±32x=6\pm3\sqrt[]{2}x=6±32
ax2+bx+c=0ax^2+bx+c=0ax2+bx+c=0 의 근은?
x=−b±b2−ac2ax=\frac{-b\pm\sqrt[]{b^2-ac}}{2a}x=2a−b±b2−ac
x=b±b2−4ac2ax=\frac{b\pm\sqrt[]{b^2-4ac}}{2a}x=2ab±b2−4ac
x=b±b2−acax=\frac{b\pm\sqrt[]{b^2-ac}}{a}x=ab±b2−ac
x=−b±b2−4ac2ax=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}x=2a−b±b2−4ac
x2+4x−6=0x^2+4x-6=0x2+4x−6=0 의 근은?
x=−2±102x=\frac{-2\pm\sqrt[]{10}}{2}x=2−2±10
x=2±102x=\frac{2\pm\sqrt[]{10}}{2}x=22±10
x=2±10x=2\pm\sqrt[]{10}x=2±10
x=−2±10x=-2\pm\sqrt[]{10}x=−2±10
x2+5x−7=0x^2+5x-7=0x2+5x−7=0 의 근은?
x=−5±532x=\frac{-5\pm\sqrt[]{53}}{2}x=2−5±53
x=5±532x=\frac{5\pm\sqrt[]{53}}{2}x=25±53
x=−5±53x=-5\pm\sqrt[]{53}x=−5±53
x=5±53x=5\pm\sqrt[]{53}x=5±53
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