一元二次方程配方法二题的第三个,要求有过程,最好写在一张纸上
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(1)
x^2+6x+ 9 = (x+3)^2
(3)
4x^2+4x +(1/4) = (2x+ 1/2)^2
(3)
(1)
x^2+10x+16=0
(x+5)^2 = 9
x+5 = 3 or -3
x=-2 or -8
(3)
3x^2+6x-5 =0
x^2 +2x = 5/3
(x+1)^2 = 8/3
x+1 = (2/3)√6 or -(2/3)√6
x = -1+(2/3)√6 or -1-(2/3)√6
x^2+6x+ 9 = (x+3)^2
(3)
4x^2+4x +(1/4) = (2x+ 1/2)^2
(3)
(1)
x^2+10x+16=0
(x+5)^2 = 9
x+5 = 3 or -3
x=-2 or -8
(3)
3x^2+6x-5 =0
x^2 +2x = 5/3
(x+1)^2 = 8/3
x+1 = (2/3)√6 or -(2/3)√6
x = -1+(2/3)√6 or -1-(2/3)√6
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