Question

21 | Efetue estas multiplicaçoes no
processo que preferir.
a) (a+ 1) . (a+2)
b) (r + 5).(r+3)
c) (x+3)(x+4)
d) (3m - 5)(2m - 1)
e) (y + 2)²
f)(x+6)(x-6)
g) (x - 2)(x² - 5x + 6)​

Answer 1

Resposta:

a) $a^{2} +3a+2$

b) $r^{2} +8r+15$

c) $x^{2} +7x+12$

d) $6m^{2}-13m+5$

e) $y^{2} +4y+4$

f) $x^{2} -36$

g) $x^{3}-7x^{2} +16x-12$

Explicação passo-a-passo:

a) $(a+1).(a+2)\\a^{2}+2a+1a+2\\a^{2} +3a+2$

b) $(r+5).(r+3)\\r^{2} +3r+5r+15\\r^{2}+8r+15$

c) $(x+3)(x+4)\\x^{2} +4x+3x+12\\x^{2} +7x+12$

d) $(3m-5)(2m-1)\\6m^{2} -3m-10m+5\\6m^{2} -13m+5$

e)$(y+2)^{2} \\(y+2)(y+2)\\y^{2} +2y+2y+4\\y^{2} +4y+4$

f) $(x+6)(x-6)\\x^{2} -6x+6x-36\\x^{2} -0x-36\\x^{2} -36$

g)$(x-2)(x^{2} -5x+6)\\x^{3} -5x^{2} +6x-2x^{2} +10x-12\\x^{3}-7x^{2} +16x-12$