Answer:
The surface area is 125.66 
Hope this helps!
Answer:
hmm sorry
Step-by-step explanation:
. x² + 20 = 12x ⇔ x² - 12x + 20 = 0<span>
D = b </span> ² <span> - 4 a c = 64</span>,
. x₁, ₂ = (- b <span>±</span> √D <span>) / ( 2a)</span> = ( <span>12 ±</span>√<span> 64) / 2</span> = ( <span>12 ± 8) / 2</span><span> ,
. x</span>₁<span> </span><span> = 10 , x </span> ₂ = 2