x^2十5x十10700=12000

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x^2十5x十10700=12000x^2十5x十10700=12000x^2十5x十10700=12000x^2+5x+10700=12000x^2+5x-300=0x1=(-5+√(5^2-4×1

x^2十5x十10700=12000
x^2十5x十10700=12000

x^2十5x十10700=12000
x^2+5x+10700=12000
x^2+5x-300=0
x1=(-5+√(5^2-4×1×(-300)))÷(2×1)
=(-5+√1225)÷2
=(-5+35)÷2
=15
x2=(-5-√(5^2-4×1×(-300)))÷2
=-20
答:x1=15;x2=-20.