25(1-X)平方等于36,求x等于几

问题描述:

25(1-X)平方等于36,求x等于几

25(1-X)²=36
25(1-2x+x²)=36
25x²-50x-11=0
(5x-11) (5x+1)=0
x=11/5 或x=-1/5

25(1-X)^2=36
(1-x)^2=36/25
1-x=正负 6/5
x1=1+6/5=11/5
x2=1-6/5=-1/5