E.683. Rezolvați ecuațiile: a) x2=256;x^2 = \sqrt{256};\qquadx2=256; b) ;29(x2−3)=0;;\qquad 29(x^2-3)=0;\qquad;29(x2−3)=0; c) 2x2=1,62.2x^2=1,62.2x2=1,62.
Răspuns: a) x=±4;x=\pm4;x=±4; b) x=±3;x=\pm3;x=±3; c) x=±910;x=\pm\dfrac{9}{10};x=±109;