a) [tex]3xy ^{2} - 12y3x = 3xy ^{2} - 12xy ^{3} [/tex]
b) [tex]4a ^{4} - 25b ^{2} = 2 ^{2} a ^{2} \times 2 - 5 ^{2} b ^{2} [/tex]
2²a²°² acolo așa trebuie după egal
[tex]2 ^{2} \times (a ^{2} )^{2} - (5b) ^{2} [/tex]
[tex](2a ^{2} ) ^{2} - (5b) ^{2} [/tex]
[tex](2a ^{2} - 5b) \times (2a ^{2} + 5b)[/tex]
c) [tex]z ^{2} y - 14xzy + 49x ^{2} y [/tex]
[tex]y \times (z ^{2} - 14xz + 49x ^{2} )[/tex]
[tex]y \times (z - 7x) ^{2} [/tex]
d) [tex]x ^{2} a - 2x + a^{2} x - 2a[/tex]
[tex]x \times (xa - 2) + a \times (ax - 2)[/tex]
[tex](xa - 2) \times (x + a)[/tex]
[tex](ax - 2) \times (x + a)[/tex]
