karinarevenko90
karinarevenko90 karinarevenko90
  • 26-03-2020
  • Mathematics
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What is the positive root of the equation x^2 -2x=120?

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ghanami
ghanami ghanami
  • 07-04-2020

Answer:

x=12

Step-by-step explanation:

hello :

x² -2x=120  equivalent : x² -2x+1=120+1

(x-1)² = 121   means : (x-1)² = 11²...(*)

if :  x ≥0    (*) equivalent : x-1=11   so : x=12

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