Question

Calcular o valor numérico das expressões algébricas:

a)x⁵-x⁴+5,para x=1

b)x³-2x+1,para x=-1

c)4x-1/3,para x=-2

d)4x³-2x+1/3x+2,para x=-2

e)5ab - 6a² + 9b³ - 7,para a=0,b=-1

Answer 1

Ok, vamos substituir.

a)x⁵-x⁴+5,para x=1
1 - 1 + 5
5✓

b)x³-2x+1,para x=-1
(-1)³ +2*1+1
-1+3
+2 ✓

c)4x-1/3,para x=-2
4*(-2)-1/3
-8-1/3
-25/3 ✓

d)4x³-2x+1/3x+2,para x=-2
4*(-2)³-2*(-2)+1/3*(-2)+2
-32+4 - 1/6 + 2
-28 +11/6
-157/6 ✓

e)5ab - 6a² + 9b³ - 7,para a=0,b=-1
5*0*(-1)-6*0 + 9*(-1)³
0 - 0 - 9
-9 ✓

Answer 2

Explicação passo a passo:

a)x⁵-x⁴+5,para x=1

1 - 1 + 5

5✓

b)x³-2x+1,para x=-1

(-1)³ +2*1+1

-1+3

+2 ✓

c)4x-1/3,para x=-2

4*(-2)-1/3

-8-1/3

-25/3 ✓

d)4x³-2x+1/3x+2,para x=-2

4*(-2)³-2*(-2)+1/3*(-2)+2

-32+4 - 1/6 + 2

-28 +11/6

-157/6 ✓

e)5ab - 6a² + 9b³ - 7,para a=0,b=-1

5*0*(-1)-6*0 + 9*(-1)³

0 - 0 - 9

-9 ✓