X^{2} -81 find the diffrence of squares
1 answer:
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Answer:
Two distinct real solutions.
Step-by-step explanation:
Given the equation in the form , you need to find the Discriminant with this formula:
For the equation you can identify that:
Then, substituting these values into the formula, you get that the Discriminant is:
Since , then
has two distinct real solutions.
Answer:
Speed = 23809.52 cm/min
Step-by-step explanation:
Given : A car travels at constant speed for 7 days and covers 1500 miles.
To find : What is the speed in centimeters/minute
Solution : Formula to find speed is
Distance traveled = 1500 miles and time taken = 7 days
Now, we have to convert miles into centimeter and days into minutes.
1 day = 24 hours
1 hour= 60 minute
24 hr= 24×60 minute
1 day = 24×60 minute
7 days = 7×24×60 minute = 10,080 minute
Now, 1 mile = 8/5 km = 1.6 km
1 km= 100000 cm
1.6 km = 1.6 × 100000 cm
1 mile = 1.6 × 100000 cm
1500 miles = 1500×1.6 × 100000 cm = 240,000,000 cm
Put back the values into speed
Therefore, speed = 23809.52 cm/min