tolong jawabin donk no 7-8-9

7). 121-81=40+25=65
8).43-38=5+14=19
9).c.21

Mata Pelajaran : Matematika

7.)
[tex] = {11}^{2} - {9}^{2} + {5}^{2} \\ = (11 \times 11) - (9 \times 9) + (5 \times 5) \\ = 121 - 81 + 25 \\ = 40 +25 \\ = 65[/tex]
8.)
[tex] = \sqrt{1849} - \sqrt{1444} + \sqrt{196} \\ = 43 - 38 + 14 \\ = 5 + 14 \\ = 19[/tex]
9.)
[tex] \sqrt[3]{9261} = 21 \\ { 21 }^{3} = 21 \times 21 \times 21 = 9261[/tex]
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