Question

Determine o valor numerico de:
a)3.(x-8), para x=12

b)3x+x3,para x=4
c)x3-x2-2x,para x=-2
d)5,x para x=-3
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2

Answer 1

A- 3.(x-8)

3.(12-8)=
3.4= 12

B- 3x+x3
3.4+4.3
12+12
24

C-x3-x2-2x
(-2).3- (-2).2 -2 (-2)
-6+4+4
+2

D- 5.x
5.-3
-15

Answer 2

a) 3 (12 - 12)=
36-24= 12

b) 12 + 12=24

c) 6-4-4= 6-8= -2

d) 5 (-3)= - 15