Предмет: Алгебра, автор: dertaharde

Помогите решить ирацианальное уравнение И распишите по действиям

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Ответы

Автор ответа: palilov243659

Ответ:

Объяснение:

√(5x-9)=6⇒5x-9=36⇒5x=36+9=45⇒x=45/5=9

√(x²+4x-6)=4⇒x²+4x-6=16⇒x²+4x-22⇒D=16+88=104⇒√D=2√26

x1=(-4+2√26)2=-2+√26; x2=-2-√26

√(2x²+2x)=√(-x-1)⇒ $\left \{ {{2x^{2} +2x=-x-1} \atop {-x-1\geq 0}} \right.$ ⇒ $\left \{ {{x\leq -1} \atop {2x^{2}+2x+x+1=0 }} \right.$ ⇒ $\left \{ {{x\leq-1 } \atop {2x^{2}+3x+1=0 }} \right.$ ⇒D=9-8=1⇒

x1=(-3-1)/4=-1; x2=(-3+1)/4=-1/2

x=-1

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America is a nation of risk-takers. Most Americans are descendants (потомок) of immigrants who left the known of the Old World* for the unknown of the New.*

The pioneers who lived on the frontier had a hard life, so they had to be tough and self-reliant.
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К этому тексту ответить на вопросы:
1.Where did the American descendants come from?
2.Why did the pioneers have a hard life?
3.Why are Amerians optimistic?
4.What facts help to explain why Americans are responsive?
5.Where did Americans more to?