Question

Rezolvati ecuatiile:
a)25x²/3=0,(6); b)√3x²-√75=0; c)√2x²-2√2=0; d)√5x²-√245=0;
e) 16x²=√441; f) 25x²-√729=0.​

Answer 1

Răspuns:

a)25x²/3=0,(6)=6/9=2/3

25x^2=2 x1=√2/5. x2=-√2/5

b)√3x²-√75=0; /:√3. x^2=√25

x1=5. x2=-5

c)√2x²-2√2=0; /:√2. x^2=2

x1=√2. x2=-√2

d)√5x²-√245=0;/:√5. x^2=√49

x1=7. x2=-7

e) 16x²=√441; 16x^2=√9×√49

x1=3×7/4=21/4. x2=-21/4

f) 25x²-√729=0.

25x^2=√27×27

x1=27/5. x2=-27/5