QUESTION IMAGE
Question
- 求x的值:$2(x + 1)^2 - 49 = 1$。
Step1: 移项合并常数项
$2(x+1)^2 = 1 + 49$
$2(x+1)^2 = 50$
Step2: 两边同除以2
$(x+1)^2 = \frac{50}{2}$
$(x+1)^2 = 25$
Step3: 开平方求x+1
$x+1 = \pm\sqrt{25}$
$x+1 = \pm5$
Step4: 分情况求x
当$x+1=5$时,$x=5-1=4$;
当$x+1=-5$时,$x=-5-1=-6$。
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$x=4$或$x=-6$