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rezolva ecuatiile

a)2(x+7)-15+2x-1
b)x*(x+2)=0


Răspuns :

a)2x+14-15+2x-1=0
4x-2=0
4x=2 /:4
x=2/4=1/2
b) x la puterea 2+2x=0
x la a doua = -2x
x ori x= -2x/:x
x=-2

(2x+14)-15+2x-1
2x+2x-14+15-1
4x-18
x=18+4
2x+2x=0
4x=0
x=4:0
x=0