Question

Daca 3pe5=x 10,sa se calculeze x²+2x-80

Answer 1

5x=10×3
x=6
6 la a doua+12-80
36+12-80
48-80
=-32

Answer 2

$\frac{3}{5}= \frac{x}{10}=\ \textgreater \ x= \frac{10*3}{5} =\ \textgreater \ x= \frac{30}{5}=\ \textgreater \ x=6 \\ x^{2} +2x-80= 6^{2}+2*6-80=36+12-80=-32$