Answer:
x = ± 
, x = ± i
Step-by-step explanation:
f(x) = 
- x² - 2
to find the zeros , equate f(x) to zero , that is
- x² - 2 = 0
using the substitution u = x² , then
u² - u - 2 = 0 ← in standard form
(u - 2)(u + 1) = 0 ← in factored form
equate each factor to zero and solve for u
u - 2 = 0 ⇒ u = 2
u + 1 = 0 ⇒ u = - 1
convert u back into terms of x
x² = 2 ( take square root of both sides )
x = ±
x² = - 1 ( take square root of both sides )
x = ± 
= ± i
Answer:
(-3,-4)
Step-by-step explanation:
Answer:
130°
Step-by-step explanation:
Answer:
$39.56
Step-by-step explanation:
If he gets a 25% discount, then he is basically buying the sleeping bag for 75% (75%=0.75) of the original price.
$52.75x0.75
=$39.5626
≈$39.56
(Since money only goes to the hundredths place it is rounded)
He will pay $39.56 for the sleeping bag.
600 = 45x (x= minutes)
13.3333333=x
1*(2/3) = 80 minutes
80x= 13.333333*80
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Therefore the airplane flies 1066.66664 km in 80 minutes or 1 2/3 hours
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