Jawaban:
dibawah
Penjelasan dengan langkah-langkah:
[tex] - ({2r}^{2} - 9r) - ( {r}^{2} - 7r) = \\ - {2r}^{2} +9r- {r}^{2} + 7r = \\ - 3 {r}^{2} + 16r[/tex]
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Jawaban:
dibawah
Penjelasan dengan langkah-langkah:
[tex] - ({2r}^{2} - 9r) - ( {r}^{2} - 7r) = \\ - {2r}^{2} +9r- {r}^{2} + 7r = \\ - 3 {r}^{2} + 16r[/tex]