3 years ago

Solve the quadratic equation: x^2+ 2x + 7 = 21

Mathematics

1 answer:

Crank3 years ago

3 0

Answer:

x1 = -4.872983346

x2 = 2.872983346

Step-by-step explanation:

Given:

x^2+2x+7=21

Subtract 21 on both sides to get the right side equal to 0:

x^2+2x-14=0

Use the quadratic formula:

x1 = -4.872983346

x2 = 2.872983346

You might be interested in

Solve this quick. plz

bulgar [2K]

120

OA = OB

angle OAN = 90 degrees, so OAB and OBA is both 30 degrees.

6 0

3 years ago

A boat is 10 miles away from a lighthouse that sits on top of a coral reef with a 4 mile radius. At what angle does the captain

lora16 [44]

Answer:

Step-by-step explanation:

233

4 0

3 years ago

There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 2 9 . There are 63 m

Tatiana [17]

The main idea is the number of marbles and the denominator of the probability. All you have to do is multiply the fraction by a fraction which is equal to 1 which makes the denominator equal to 63. We know 63 is a multiple of 9. 9 goes 7 times in 63 so we multiple the fraction $\frac{2}{9}$ with $\frac{7}{7}$ which gives, $\frac{2 * 7}{9 * 7}$ which when evaluated gives $\frac{14}{63}$ and the numerator is the number of red marbles in the bag. So there are 14 red marbles in the bag :D