Question

Macar primul ex daca vi se pare greu restul!! Multumesc!!

Answer 1

1a) DVA: 4X-5≥0 ⇒X≥5/4

       4X-5=3 ⇔4X=8⇔X=2
  b)12-5x=3-2√6+2⇔-5x=-7-2√6 ⇔x=(7-2√6)/5

c)6x+1=5-4√5+4 ⇔6x=8-4√5 ⇔x=(4-2√5)/3

d)3x+4=25+10√2+2⇔3x=23+10√2 ⇔x=(23+10√2)/3

2)a)x≥3
   7-√(x-3)=9 ⇔√(x-3)=-2⇔S=∅