Question

Rezolvati ecuatile din imagine.

Answer 1

a)(x*2+2×x+1)-x*2+4=3
2x+5=3
2x=-2
x=-1
b) (9+ 15):6rad3×y=8
4:rad3×y=8 ==>y=2×rad3

Answer 2

a)( x+1)²-(x+2)(x-2)=3, x∈ Z
(x²+2x+1)-(x²-4)=3
x²+2x+1-x²+4=3
2x+5=3
2x=3-5
x=-1

b) $\frac{ \sqrt{81}+ \sqrt{225} }{2 \sqrt{27} } *y=8 \\ \frac{9+15}{6 \sqrt{3} } *y=8 \\ = \frac{24y}{6 \sqrt{3} }=8 \\ = \frac{4y}{ \sqrt{3}} =8 \\ y=2 \sqrt{3}$, x∈ R