Question

-2root20+2root18-2root5
Please answer the following

Answer 1

Solution:

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i ) √20 = √2×2×5 = 2√5

ii) √18 = √3×3×2 = 3√2

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Now ,

-2√20 + 2√18 -2√5

= -2(2√5) + 2(3√2) -2√5

= -4√5 + 6√2 - 2√5

= -4√5 - 2√5 + 6√2

= (-4-2)√5 +6√2

= -6√5 + 6√2

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