Question

1. Rezolvati urmatorele ecuatii irationale.
a. radical 1- 7x = -3
b. radical 1- 3x= 3
c. radicat x la 3 +16 = -2
d. radical x la 2 + 5x - 4 = radical x la 2 + 2
Nu am cum sa fac radicalul si din x la o putere , as avea nevoie de raspunsuri pana maine. Multumesc!

Answer 1

1. √1-7x=-3
conditii de existenta: 1-7x≥0
√1-7x=-3 ↑2 => 1-7x=9 =>-7x=8=>x=-8/7
verificarea conditiilor: 1-7·(-8/7)≥0 A

S={-8/7}

2.
√1-3x=3
c.e: 1-3x≥0
√1-3x=3↑2=> 1-3x=9=>-3x=8=>x=-8/3
v.c: 1-3·(-8/3)≥0 A
S={-8/3}