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Bacchus
Mathematics
21 July, 19:00
Factor by grouping. a2 + ab - 56b2
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Kaiden Mercado
21 July, 19:03
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a^2 + ab - 56b^2
= a^2 + 8ab - 7ab - 56b^2
= a (a+8b) - 7b (a + 8b)
= (a-7b) (a+8b).
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Hans
21 July, 19:30
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A^2 + ab - 56b^2
Factor by grouping is typically done when you have 4 terms not 3.
This is a trinomial that is factorable as is.
If it has to be done by grouping I can do that also. Let me know.
What are the factors of - 56 that add up to 1?
8 * (-7) = - 56
8 + (-7) = 1
(a + 8b) (a - 7b)
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