please ................
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Answered by
0
hey mate
7a(7a-9b)-9b(7a-9b)
49a^2- 63ab-63ab+81b^2
49a^3-126ab+81b^2
hope it's helps
Answered by
1
(7a-9b)(7a-9b)
=(7a-9b)^2
(7a)^2+(9b)^2-2.7a.9b
using[a-b]^2
somen69:
formula
+or-
a^2 - 2ab - b^2
right??
or not
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