Question

Determine o valor numérico de:
a) 5(2x -3) , para x= 4
b) x³ -x² ,para x= -3
c)x² +3x + 2 ,para x= -2
d) x² -5x +6 ,para x=3
e)x³ +2x² +x/2 +1 ,para x=2

Answer 1

$5(2 \times 4 - 3) \\ 5(8 - 3) \\ 40 - 15 = 25 \\ \\ \\ { - 3}^{3} - ( - {3}^{2} ) \\ - 27 + 9 = - 18 \\ \\ \\ \\ - {2}^{3} + 3 ( - 2) + 2 \\ - 4 - 6 + 2 = - 8 \\ \\ \\ \\ {3}^{2} - 5 \times 3 + 6 \\ 9 - 15 + 6 = 0 \\ \\ \\ \\ {2}^{3} + 2 \times {2}^{2} + \frac{2}{2} + 1 \\ 8 + 8 + 1 + 1 = 18$