Explicación paso a paso:
1)
[tex]3 {m}^{2} a + (5a - 5 {m}^{2} a) - 7 {m}^{2} a \\ = 3 {m}^{2} a + 5a - 5 {m}^{2} a - 7 {m}^{2} a \\ = - 9 {m}^{2} a + 5a[/tex]
2)
[tex] - 2mx + 5 {a}^{2} - 3mx - 2{a}^{2} \\ = - 5mx + 3 {a}^{2} [/tex]
3)
[tex]3ax - 2 {m}^{2} + {m}^{2} - 3ax + {b}^{2} \\ = - {m}^{2} + {b}^{2} [/tex]
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Verified answer
Explicación paso a paso:
1)
[tex]3 {m}^{2} a + (5a - 5 {m}^{2} a) - 7 {m}^{2} a \\ = 3 {m}^{2} a + 5a - 5 {m}^{2} a - 7 {m}^{2} a \\ = - 9 {m}^{2} a + 5a[/tex]
2)
[tex] - 2mx + 5 {a}^{2} - 3mx - 2{a}^{2} \\ = - 5mx + 3 {a}^{2} [/tex]
3)
[tex]3ax - 2 {m}^{2} + {m}^{2} - 3ax + {b}^{2} \\ = - {m}^{2} + {b}^{2} [/tex]