Explicación paso a paso:
[tex]1) \: 7 {x}^{2} + 21x[/tex]
[tex]2) \: 5 {x}^{3} - 5 {x}^{2} [/tex]
[tex]3) \: 5x^{3} - 5 {x}^{2} [/tex]
[tex]4) \: 3 {x}^{3} - 6 {x}^{3} [/tex]
[tex]5) \: 5 {x}^{3} - 5{x}^{2} [/tex]
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Verified answer
Explicación paso a paso:
[tex]1) \: 7 {x}^{2} + 21x[/tex]
[tex]2) \: 5 {x}^{3} - 5 {x}^{2} [/tex]
[tex]3) \: 5x^{3} - 5 {x}^{2} [/tex]
[tex]4) \: 3 {x}^{3} - 6 {x}^{3} [/tex]
[tex]5) \: 5 {x}^{3} - 5{x}^{2} [/tex]