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① x2=49
x=7
x=-7
x=±7
x=√7
x=±√7
② x2=12
x=±√12
x=±2√3
x=±2√6
x=±3√2
x=±6√2
③ x2=125x^2=\frac{1}{25}x2=251
x=15x=\frac{1}{5}x=51
x=−15x=-\frac{1}{5}x=−51
x=±15x=\pm\frac{1}{5}x=±51
x=±125x=\pm\sqrt{\frac{1}{25}}x=±251
その他
④ x2=13x^2=\frac{1}{3}x2=31
x=33x=\frac{\sqrt{3}}{3}x=33
x=−33x=-\frac{\sqrt{3}}{3}x=−33
x=±33x=\pm\frac{\sqrt{3}}{3}x=±33
x=±13x=\pm\sqrt{\frac{1}{3}}x=±31
⑤ 3x2=108
x=6
x=-6
x=±6
x=±6√3
⑥ -6x2=12 (a)
⑦ x2-5=4
x=0
x=±1
x=±3
x=±9
⑧ 23x2−1=12\frac{2}{3}x^2-1=\frac{1}{2}32x2−1=21
x=±32x=\pm\frac{3}{2}x=±23
x=±1x=\pm1x=±1
x=±94x=\pm\frac{9}{4}x=±49
解なし
⑨ x2+8=-4x2+38
x=±√6
x=±√230/5
x=±√30
⑩ 2x2-6x=(x-1)(x-5)
x=±√5
x=0,1,3,5
x=±√15
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