Multiplication of surds :
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4
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hope it helps you please make my answer as brainlist
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2
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68
Step-by-step explanation:
(4√5 - 2√3) (4√5 + 2√3)
= (4√5)² - (2√3)²
= (16×5) - (4×3)
= 80 - 12
= 68
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