Question

me ajudem por favor!

a) (x+2).(x+2) =

b) (x-3).(x-3) =

c) (x+7).(x-5)=

d) (x-7)(x-9)=

e) (5x + 2). (3x² – 4) =

f) (3x – 4).(2x + 5) =​

Answer 1

Oie, Td Bom?!

a)

$(x + 2) \: . \: (x + 2) \\ x \: . \: (x + 2) + 2(x + 2) \\ x {}^{2} + 2x + 2x + 4 \\ x {}^{2} + 4x + 4$

b)

$(x - 3) \: . \: (x - 3) \\ x \: . \: (x - 3) - 3(x - 3) \\ x {}^{2} - 3x - 3x + 9 \\ x {}^{2} - 6x + 9$

c)

$(x + 7) \: . \: (x - 5) \\ x \: . \: (x - 5) + 7(x - 5) \\ x {}^{2} - 5x + 7x - 35 \\ x {}^{2} + 2x - 35$

d)

$(x - 7) \: . \: (x - 9) \\ x \: . \: (x - 9) - 7(x - 9) \\ x {}^{2} - 9x - 7x + 63 \\ x {}^{2} - 16x + 63$

e)

$(5x + 2) \: . \: (3x {}^{2} - 4) \\ 5x \: . \: (3x {}^{2} - 4) + 2(3x {}^{2} - 4) \\ 15x {}^{3} - 20x + 6x {}^{2} - 8$

f)

$(3x - 4) \: . \: (2x + 5) \\ 3x \: . \: (2x + 5) - 4(2x + 5) \\ 6x {}^{2} + 15x - 8x - 20 \\ 6x {}^{2} + 7x - 20$

Att. Makaveli1996