X^2+10x-1200=0

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X^2+10x-1200=0X^2+10x-1200=0X^2+10x-1200=0x2+10x-1200=0x2+10x=1200x2+10x+52=1225(x+5)2=根号1225x+5=±35

X^2+10x-1200=0
X^2+10x-1200=0

X^2+10x-1200=0
x2+10x-1200=0
x2+10x=1200
x2+10x+52=1225
(x+5)2=根号1225
x+5=±35
x1=30 x2=-40