Question

Please help me. 20 points for right answer

Answer 1

Step-by-step explanation:

(√9+4√5)-{1/√(9+4√5)}

=4.15 answer

I think so I have helped u

Answer 2

Answer:

√x - 1/√x=4

Step-by-step explanation:

x=9+4√5=4+5+2*2√5

=2²+(√5)²+2*2√5

x=(2+√5)²

√x=2+√5..............................(1)

1/√x=1/2+√5)

= 2-√5/(2+√5)*((2-√5)

=(2-√5)/(4-5)

=(2-√5)/-1

1/√x=-2+√5..........................(2)

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Now

√x - 1/√x

=2+√5 -(-2+√5)

=2+√5+2-√5

=4