You add each number that is in the same position correlated to the box. Ex: 12+-3=9
(2√5 + 3(√7))^2
(2√5 + 3(√7))(2√5 + 3(√7))
4*5 + 6√35 + 6√35 + 9*7
20 + 12√35 + 63
20 + 63 + 12√35
83 + 12√35
Answer:
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Step-by-step explanation:
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hope it helps
The answer is 48 degrees because you add 42 and 90 and then subtract from 180 (total degrees of a triangle)