Question

Va rogg
Doar cele doua exerciti colorate cu rosu

Answer 1

3.
a)x³+5x²-9x-45=x²(x+5)-9(x+5)=(x+5)(x²-9)=(x+5)(x-3)(x+3)
b)x²-10x+16=x²-2x-8x+16=x(x-2)-8(x-2)=(x-8)(x-2)

4.
Diag.AC,se,calculeaza,cu,t.Pit.
AC²=100+25=125=>AC=5√5
=>AO=OC=BO=OD=5√5/2
In,ΔdrDAE,DE²=25+9=34=>DE=√34

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