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-14-4a
.
_
=20b - 100
b.(a+5) x (5a-1)
=5a² + 1a + 10a - 5
=5a² + 11a - 5
c.(7-2a) x (2a-7)
=14a - 49 - 4a² + 14a
= 4a² - 49