(1)x^2+16x=0 (2)5x^2-10x=-5
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(1)x^2+16x=0(2)5x^2-10x=-5(1)x^2+16x=0(2)5x^2-10x=-5(1)x^2+16x=0(2)5x^2-10x=-5(1)x^2+16x=0x(x+16)=0x
(1)x^2+16x=0 (2)5x^2-10x=-5
(1)x^2+16x=0 (2)5x^2-10x=-5
(1)x^2+16x=0 (2)5x^2-10x=-5
(1)x^2+16x=0
x(x+16)=0
x=0或x=-16
(2)5x^2-10x=-5
5x^2-10x+5=0
x^2-2x+1=0
(x-1)^2=0
x=1
(1)x^2+16x=0
x(x+16)=0
x1=0,x2=-16
(2)5x^2-10x=-5
x²-2x=-1
x²-2x+1=0
(x-1)²=0
x=1
解
x^2+16x=0
x(x+16)=0
x=0或x=-16
5x^2-10x=-5
x^2-2x=-1
x^2-2x+1=0
(x-1)^2=0
x-1=0
x=1
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