Question

Dada a expressão 3x² - 5x + 8, calcule o valor numérico para=

a) x=6
b) x=-4
c)x=2/3

Answer 1

a) 3.$6^{2}$ - 5.6 + 8=
108 - 30+8
108-38= 70

b)3.$-4^{2}$-5.-4+8=
64+28=92

c)3.$\frac{2}{3} ^{2}$-5.$\frac{2}{3}$+8=
12/9-10/3+8
1,3-3,3+8= 6