(a-3b) (4a + 5b) -45b +25a
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Given (a-3b)(4a + 5b) - 45b + 25a ---- (1)
(a - 3b)(4a + 5b) = 4a^2 - 7ab - 15b^2. ---- (2)
Substitute (2) in (1)
4a^2 - 7ab - 15b^2 - 45b + 25a.
(a - 3b)(4a + 5b) = 4a^2 - 7ab - 15b^2. ---- (2)
Substitute (2) in (1)
4a^2 - 7ab - 15b^2 - 45b + 25a.
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