求下列各式中X的值:(1)(X+1)²=49 (2)25x²-64=0(x<0)快
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![求下列各式中X的值:(1)(X+1)²=49 (2)25x²-64=0(x<0)快](/uploads/image/z/1780181-53-1.jpg?t=%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E4%B8%ADX%E7%9A%84%E5%80%BC%3A%281%29%28X%2B1%29%26%23178%3B%3D49+%EF%BC%882%EF%BC%8925x%26%23178%3B-64%3D0%EF%BC%88x%EF%BC%9C0%EF%BC%89%E5%BF%AB)
求下列各式中X的值:(1)(X+1)²=49 (2)25x²-64=0(x<0)快
求下列各式中X的值:(1)(X+1)²=49 (2)25x²-64=0(x<0)
快
求下列各式中X的值:(1)(X+1)²=49 (2)25x²-64=0(x<0)快
(1)(X+1)²=49
x+1=+-7
x=6或x=-8
(2)25x²-64=0
(5x-8)(5x+8)=0
x=8/5或x=-8/5
因为(x<0)
x=-8/5
(1)(X+1)²=49
X+1=7 或 X+1=-7
X=6 或 X=-8
(2)25x²-64=0(x<0)
25x²=64
x²=64/25
x=-8/5 (x<0)
不懂可追问,望采纳!
(1)X=6
(2)X=负8/5 (负五分之八)