Matemática 2 - Colégio Soter

Colégio SOTER - Caderno de Atividades - 8º Ano - Matemática - 2º Bimestre
e) (x + 1) 2 – (x – 2) 2 = _________________________________________________________________________
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f) ½[(x + 1) 2 + (x – 1) 2 ] = ______________________________________________________________________
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g) (m – 1) 2 – (m + 1)(m – 1) = ___________________________________________________________________
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h) (x + 4)(x – 4) – (x – 4) 2 = _____________________________________________________________________
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22) (2a – 5b)² é o mesmo que:
a) 4a² – 20a²b² + 25b² b) 4a² + 20ab – 25b² c) 4a² + 20ab + 25b² d) 4a² – 20ab – 25b² e) 4a² – 20ab + 25b²
Resolução: __________________________________________________________________________________
23) A expressão (2n+1)² + (n+2)² + 2(n+1)·(n-1) é igual a:
a) 7n² + 6n + 3 b) 7n² + 6n – 3 c) 7n² + 6n + 4 d) 7n² + 8n + 4 e) 7n² + 8n + 3
Resolução: __________________________________________________________________________________
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24) Fatore as expressões:
4. Fatoração
a) 7q 2 – 28 = _______________________________ b) 33x + 22y – 55z = ______________________________
c) x 6 + x 7 + x 8 = ____________________________ d) 36 cd + 6 cd 2 = _________________________________
e) x(a + b) + y(a + b) = ______________________ f) 2a(x – 1) – b(x – 1) = ____________________________
g) 7a – 7c + ma – mc = _______________________ h) a 3 + 3a 2 + 2a + 6 = ______________________________
i) x 3 – x 2 + 5x – 5 = __________________________ j) x 2 – 36 = _______________________________________
l) 25 – a 2 = _________________________________ m) 9x 2 – 16 = _____________________________________
n) 9x 2 – 16 = _______________________________ o) 1 – 81a 2 = _____________________________________
p) 100 – π 2 = ______________________________ q) 36x 4 – y 6 = _____________________________________
r) x 2 + 2x + 1 = ______________________________ s) x 2 – 2x + 1 = ___________________________________
t) 1 – 6m + 9m 2 = ___________________________ u) x 2 + 12x + 36 = _________________________________
v) 36a 2 – 12ac + c 2 = _________________________ x) y 4 + 4y 2 + 4 = __________________________________
25) Agrupe os termos e fatore:
a) 5x + ax + 5y + ay = _________________________________________________________________________
b) x 3 + 2x 2 + 7x + 14 = ________________________________________________________________________
c) c 2 – c + cx – x = ____________________________________________________________________________
d) ax + bx + ay + by + az + bz = ________________________________________________________________
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