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Abdiel Oconnor
Mathematics
16 September, 18:46
Factorise fully
21a - 7a^2
+4
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2
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Felicity Burns
16 September, 19:05
0
7 (3a-a^2)
Step-by-step explanation:
7 divided into 21 is 3
7 (3a-a^2)
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Chaz Torres
16 September, 19:06
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3a (7-a)
Have a great day!
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