Question

determinati x e Q pentru care : |2x-3| = 5

C) |4x la puterea2 -3 | = 33

Answer 1

a)daca este vorba de modul,atunci avem 2 ecuatii diferite:
2x-3=5⇒2x=5+3⇒2x=8⇒x=8\2⇒x=4 si 
2x-3=-5⇒2x=-5+3⇒2x=-2⇒x=(-2)\2⇒x=-1
C)4x²-3=33⇒4x²=36⇒x²=36/4⇒x²=9⇒x=3 si
    4x²-3=-33⇒4x²=-30⇒x²=(-30)/4⇒x²=-7,5⇒x=-√7,5≈-2,73