4 20 − 3 45 = 4 ∗ 2 5 − 3 ∗ 3 5 = = 8 5 − 9 5 = = − 5
To simplify 4 20 − 3 45 , we first simplify each square root. We find that 4 20 = 8 5 and − 3 45 = − 9 5 , leading to the final simplified expression − 5 .
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