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PLEASE SEE THE ATTACHMENT AND TELL ME HOW TO DO. TELL ME THE METHOD.(the answer is -2)

PLEASE SEE THE ATTACHMENT AND TELL ME HOW TO DO. TELL ME THE METHOD.(the answer is -2)

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Grade:9

1 Answers

durgesh patel
13 Points
6 years ago
{a-2√(a-1)}^1/2-{a+2√(a-1)}^1/2={(a-1)-2.√(a-1).1+1}^1/2-{(a-1)+2√(a-1).1+1}^1/2=√(a-1)-1-√(a-1)-1=-2

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