a₁=4x+5 a₂=7x-1 a₃=x²+2
d=7x-1-(4x+5)=7x-1-4x-5=3x-6.
a₃=a₁+2d
x²+2=4x+5+2*(3x-6)
x²+2=4x+5+6x-12
x²+2=10x-7
x²-10x+9=0 D=64 √D=8
x₁=9 x₂=1.
Ответ: x₁=9 x₂=1.
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a₁=4x+5 a₂=7x-1 a₃=x²+2
d=7x-1-(4x+5)=7x-1-4x-5=3x-6.
a₃=a₁+2d
x²+2=4x+5+2*(3x-6)
x²+2=4x+5+6x-12
x²+2=10x-7
x²-10x+9=0 D=64 √D=8
x₁=9 x₂=1.
Ответ: x₁=9 x₂=1.