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Phantasy [73]
3 years ago
14

X2+2x-15=0 Find the quadratic formula

Mathematics
1 answer:
Alekssandra [29.7K]3 years ago
3 0

Answer:

Step-by-step explanation:

For a quadtratic in the form of

ax^{2} + bx + c = 0

The solutions to this can be found using the quadratic formula:

x = \frac{-b \pm \sqrt{b^{2} - 4ac}}{2a}

For the given equation, a = 1, b = 2, c = -15. Plugging these numbers into the formula will give you the answer.

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nata0808 [166]

Answer:

469.42 ft²

Step-by-step explanation:

  • Law of sines;

         w/sin27 = 38/sin40

                   w = sin27*38/sin40

                    w = 26.84 ft

  • Angle x;

            ∡X = 180 - 27- 40 = 113º

  • Area;

              A = 0.5*(26.84)*(38)*sin(113)

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Using the Pythagoras theorem

8^2 = 5^2 + x^2   where x = 1/2 length of the base

x^2 = 64-25 = 39

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3 years ago
Find the common ratio<br> -8,-13,-18,-23<br>A. -21<br>B. 5<br>C.-5<br>D.-23
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NEED HELP PLZ!!!!!!George and John travel 392 miles in 7 hours. If they travel at the same rate, how long will it take them to t
Paraphin [41]

Answer:

Step-by-step explanation:

a. Find the unit rate, or how many miles they traveled in one hour, by dividing:

\frac{392}{7}=56 mph

b. Now that we know how fast they were going, we can use it in either a proportion or in the d = rt equation. For the proportion set up, put miles on the top and hours on the bottom and solve for the unknown:

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