Question

(7$\sqrt{5}$+12$\sqrt{5} -11 \sqrt{5})$≤$\sqrt{20}$*(x-$\sqrt{5}$)
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Answer 1

√20=2√5
⇒(19√5-11√5)≤√20x-√20√5
8√5≤2√5x-√100
-2√5x≤-8√5-10      ·-1
x≥2(4√5-5)/2√5
x≥(4√5-5)/√5 rationalizam
x≥(20-5√5)/5  ⇒    x≥5(4-√5)/5
x≥4-√5