5) Calcule:
a) (2x2-9x+2)+(3x2+7x-1)=
b) (5x2+5x-8)+(-2x2+3x-2)=
c) (4x-y-1)-(9x+y+3) =
d) (-2a2-32+6)-(-4a2-52+5)=
e) (x+5)-(x+2) =
f) (3x+2).(2x+1)=
g) (x+7).(x-4)=
h) ( 12x2 - 8x) : (+2x) =
i) (3y3 + 6y2) : (3y) =
j) ( 10x2 + 6x) : (-2x) = k) (4x³-9x): (+3x)
Soluções para a tarefa
Respondido por
5
Resposta:
a) 2x2-9x+2 +3x2+7x-1=
2x2+3x2-9x+7x+2-1=
5x2-2x+1
b)(5x2+5x-8)+(-2x2+3x-2)=
5x2-2x2+5x+3x-8-2=
3x2+8x-10
c)4x+9x-y-y-1-3=
13x-2y-4
d)-2a2+4a2-3^2+5^2+6-5=
2a2+16+1=
2a2+17=
a2=-17/2
a= +-√-17/2 (não pertence a R)
e)(x+5)-(x+2)=
x+5-x-2=
5-2=3
f)(3x+2)(2x+1)=
6x2+3x+4x+2=
6x2+ 7x+2
g) (x+7)(x-4)=
x2-4x+7x-28=
X2+3x-28
h)(12x2-8x)÷(2x)=
6x-4
i). (3y3+6y2)÷(3y)=
y2+2y
j) (10x2+6x)÷(-2x)=
-5x-3
k)(4x3-9x)÷(3x)=
4/3x2-3
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