Answer:
(-3, -2) that is the answer please give me brainiest
Step-by-step explanation:
Answer:
x = - 1 ± 2i
Step-by-step explanation:
we can use the discriminant b² - 4ac to determine the nature of the roots
• If b² - 4ac > , roots are real and distinct
• If b² - 4ac = 0, roots are real and equal
• If b² - ac < 0, roots are not real
for x² + 2x + 5 = 0
with a = 1, b = 2 and c = 5, then
b² - 4ac = 2² - (4 × 1 × 5 ) = 4 - 20 = - 16
since b² - 4ac < 0 there are 2 complex roots
using the quadratic formula to calculate the roots
x = ( - 2 ± ) / 2
= (- 2 ± 4i ) / 2 = - 1 ± 2i
Answer:
Step-by-step explanation:
the answer is 14
The answer is 3
5x = 16-1
5x = 15
x = 3
Let's assign variables
The time required to <span>wire a building: y
</span>
The number of electricians <span>to have done this job: x
</span>
<span>y varies inversely as x
so that:
where k is the proportional constant
To calculate the value of k, plug in the values of x and y:
x=7
y=4
Now, write down the relation between x and y:
"</span><span>how long would it have taken 3 electricians to have done the job?"
x=3
Let's find out y:
So it would take 9 hours and 20 minutes to have this job done.
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