Verified answer

√(x + 9 ) = 4

x + 9 = 4^2

x = 16 - 9 = 7

if your question is √ ( 8 - x + 6 ) = 4

then

√ ( 14 - x ) = 4

( 14 - x ) = 4^2

x = 14 - 16 = -2

3.....√ ( 2x + 20) + 2 = x

√ ( 2x + 20 ) = x - 2

squaring on both sides

2x + 20 = x^2 - 4x + 4

x^2 - 6x - 16 = 0

( x - 8 ) ( x + 2 ) = 0

x - 8 = 0 or x + 2 = 0

x = 8 or x = - 2

but x = 8 is the extraneous root since x = -2 doesn't satisfies the equation

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Can you edit the question to include brackets?

I don't know if you mean √x + 9 or √(x+9).