Question

Multiply √3-√7+2√5 by √3+√7-2√5

Answer 1

Answer: ( √3 - √7 + 2√5 ) × ( √3 + √7 - 2√5 )

= √3×√3 + √3×√7 - √3×2√5 - √7×√3 - √7×√7 +

√7×2√5 + 2√5×√3 + 2√5×√7 - 2√5×2√5 .

= 3 - 7 + 4√35 - 20 = 3 + 4√35 - 27

= 26.6 - 27 = -0.4 .

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