解方程 ⑴3x^2+4x-7 ⑵5(2x-1)^2=80 ⑶ (x+17)^2=49
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解方程 ⑴3x^2+4x-7 ⑵5(2x-1)^2=80 ⑶ (x+17)^2=49
解方程 ⑴3x^2+4x-7 ⑵5(2x-1)^2=80 ⑶ (x+17)^2=49
解方程 ⑴3x^2+4x-7 ⑵5(2x-1)^2=80 ⑶ (x+17)^2=49
3x^2+4x-7=0
1 -1
3 7=7-3=4
(x-1)(3x+7)=0
x=1 x=-7/3
5(2x-1)^2=80
(2x-1)^2=16
2x-1=±4
x=5/2 x=-3/2
(x+17)^2=49
x+17=±7
x=-10 x=-24
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