7. Factorize : 4a2 + 9b2 + 25c2 + 12ab - 30bc - 20ca
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6
Answer:
Let's arrange these first
=> 4a² + 12ab + 9b² - (8a + 12b)
Here (2a + 3b) = 4a² + 12ab + 9b²
and
(8a + 12b) = 4(2a + 3b)
=> (2a + 3b)² - 4(2a + 3b)
=> (2a + 3b)(2a + 3b - 4)
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