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Scoala48
a fost răspuns

2x-|x+4|=10
urgentttt

Răspuns :

Vintilămarya
a) 2x-x+4=10
b) 2x-x+4= -10

a) x+4=10
x=6
b) x+4= -10
x= -10-4
x= -14
I metoda
2x-10=Ix+4I
DVA:2x-10≥0⇒x≥5

(2x-10)²=(x+4)²⇔4x²-40x+100=x²+8x+16⇔3x²-48x+84=0 (:3)
                                                                      x²-16x+28=0
                                                                      x1=2∉DVA
                                                                      x2=14∈DVA
S={14)
 II metoda
2x-10=x+4  sau  -2x+10=x+4
x=14            sau   -3x=-6⇔x=2∉DVA

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