Question

Calculati valoarea expresiei algebrice 2x²-3x pentru: a)x=0 b)x=-2 c)x=0,5 d)x=$\frac{1}{6}$

Answer 1

a) 2*0^2-3*0=0
b)2*2^2-3*2=2*4-6=8-6=2
c) 2*0.5^2-3*0.5=0.5-1.5=-1
d) $2 \frac{1}{6}^2 -3* \frac{1}{6} = 2 \frac{1}{36} - \frac{3}{6} = \frac{1}{18} - \frac{3}{6} = \frac{1-9}{18}=- \frac{8}{18} = - \frac{4}{9}$

am simplificat 2 cu 36 dupa am amplificat ca sa aduc la acelasi numitor,intelegi tu