3a + 2b = 7 , ab = 2 find the value of 9a square + 4b square
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Answer:
25
Step-by-step explanation:
9a²+4b² = (3a + 2b )² - 2(3a)(2b)
=(3a+2b)² - 12ab
=(7)² - 12(2)
= 49 - 24
= 25.
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