Question

1-Resolva:

a-(3x+2y).(3x-y) b-(a+b).(a+b) c-x.(3x+1).(2x) d-x.(x+3).(x+1)


AJUDEM GENTE, É PRA HOJE!!!

Answer 1

a) (3x+2y).(3x-y) = $9x^{2}-3xy+6xy-2 y^{2}$ = $9x^{2}+3xy- 2y^{2}$

b) (a+b).(a+b) = $a^{2}+ab+ab+ b^{2}$ = $a^{2}+2ab+ b^{2}$

c) x.(3x+1).(2x) = $(3x^{2}+x).2x= 6x^{3}+2 x^{2}$

d) x.(x+3).(x+1) = $(x^{2} +3x).(x+1)= x^{3}+ x^{2} +3 x^{2} +3x= x^{3}+4 x^{2} +3x$