Question

Calcule o valor numerico da expressão 2-4x ao quadrado quando: a)x=0 b)x=-1 c)x=-2,3 d)x=10 e)x=-20 f)x=-6 g)x=1,2 h)x=8,1

Answer 1

(2-4 x)² 
a)x=0
(2-4.0)²=(2-0)² =2²=2.2=4
b)(2-4.-1)²=(2+4)²=6²=36
c)(2-4.-2,3)²=(2+9,2)²=11,2²=125,44
d)(2-4.10)²=(2-40)²=(-38)²=1444
e)(2-4.-20)²=(2+80)²=(82)²=6724
f)(2-4.-6)²=(2+24)²=26²=676
g)(2-4.1,2)²=(2-4,8)2=(-2,8)²=7,84
h)(2-4.8,1)²=(2-32,4)²=(-30,4)²=924,16

Answer 2

(2 - 4x )*, onde * = 2
4 - 16x + 16x*
a) x = 0
4 - 16.0 + 16(0)*
4

b) x = - 1
4 - (-1) + 16.(-1)*
4 + 1 + 16.1
5 + 16
21

c) x = - 2,3
4 - (-2,3) + 16.(-2,3)*
4 + 2,3 + 16.(2,3)*
6,3 +


d) x = 10
4 - 16.10 + 16.(10)*
4 - 160 + 1600
- 156 + 1600
1444

e) x = - 20
4 - 16(-20) + 16.(-20)*
4 + 320 + 16.400
324 + (4000 + 2400)
324 + 6400
6724

f) x = - 6
4 - 16.(-6) + 16.(-6)*
4 + 96 + 16.36
100 + (360 + 210)
100 + 570
670

g) x = 1,2
4 - 16.(1,2) + 16.(1,2)*


h) x = 8,1
4 - 16.(8,1) + 16.(8,1)*
4 - 129,6 + 16.65,61
-125,6 + 16.65,61
Espero tê-lo ajudado
Bons Estudos
Kelemen