(1)2X^2-5X+1=0 (2)16(X+5)^2-8(X+5)=0
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(1)2X^2-5X+1=0 (2)16(X+5)^2-8(X+5)=0
(1)2X^2-5X+1=0 (2)16(X+5)^2-8(X+5)=0
(1)2X^2-5X+1=0 (2)16(X+5)^2-8(X+5)=0
1、
2x²-5x=-1
x²-5x/2=-1/2
x²-5x/2+25/16=-1/2+25/16=17/16
(x-5/4)²=(±√17/4)²
x-5/4±√17/4
x=(5-√17)/4,x=(5+√17)/4
2、
8(x+5)[2(x+5)-1]=0
8(x+5)(2x+9)=0
x=-5,x=-9/2
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