Odpowiedź :
a) [tex]3x(5x - 7)=15x^{2}- 21x[/tex]
b)[tex]-7x(3x-5) =-21x^{2} +35x[/tex]
c)[tex]5x(3 - 5x) =15x-25x^{2}[/tex]
d)[tex]-3x(7 + 5x) =-21x-15x^{2}[/tex]
a) [tex]3x(5x - 7)=15x^{2}- 21x[/tex]
b)[tex]-7x(3x-5) =-21x^{2} +35x[/tex]
c)[tex]5x(3 - 5x) =15x-25x^{2}[/tex]
d)[tex]-3x(7 + 5x) =-21x-15x^{2}[/tex]