Question

Se considera nr -x+5,2x+3 si x-1.Calculati produsul numerelor ,stiind ca suma lor este 17.

Answer 1

$- x + 5 + 2x + 3 + x - 1 = 17$

$- x + 2x + x = 17 - 5 - 3 + 1$

$2x = 10 \: | \div 2$

$x = 5$

$( - x + 5)(2x + 3)(x - 1) = ( - 5 + 5)(2 \times 5 + 3)(5 - 1) = 0 \times 13 \times 4 = 0$