Question

Solve x= √ x+20 for x€ R​

Answer 1

Required Answer :

Observe that √x + 20 is defined only

if x +20 ≥ 0

By definition, (x + 20 ) ≥ 0.

So x is positive.

Now squaring we get

x² = x + 20.x² - x - 20 = 0

(x-5)(x+ 4) = 0, which gives x = 5, x = - 4

Since , x is positive , the required solution is

x = 5

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Answer 2

Step-by-step explanation:

your answer is

X=5

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