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mel-nik [20]
2 years ago
11

What is the most convenient method to solve the quadratic equation ( x + 4 )² = 15

Mathematics
2 answers:
Mademuasel [1]2 years ago
8 0

Answer:

B

Step-by-step explanation:

IgorC [24]2 years ago
7 0

Answer:

Factoring

Step-by-step explanation:

(x+4)² = 15

x² + 8x + 16 = 15

x² + 8x + 1 = 0

x =  \frac{ - 8 +  \sqrt{64 - 4} }{2}  =  - 4 +  \sqrt{15}  \\  \\ x =  \frac{ - 8 -  \sqrt{64 - 4} }{2}  =  - 4 -  \sqrt{15}

I hope this helps you :)

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50 quarts equals how many gallons and how many quarts?
Aliun [14]
12.5 gallons..............
6 0
3 years ago
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Find the area of the triangle with vertices: q(3,-4,-5), r(4,-1,-4), s(3,-5,-6).
maw [93]

Answer:

  (√6)/2 square units

Step-by-step explanation:

The area of a triangle is half the magnitude of the cross product of the vectors representing adjacent sides.

  QR = (4-3, -1-(-4), -4-(-5)) = (1, 3, 1)

  QS = (3 -3, -5-(-4), -6-(-5)) = (0, -1, -1)

The cross product is the determinant ...

\text{det}\left|\begin{array}{ccc}i&j&k\\1&3&1\\0&-1&-1\end{array}\right|=-2i+j-k

The magnitude of this is ...

  |QR × QS| = √((-2)² +1² +(-1)²) = √6

The area of the triangle is half this value:

  Area = (1/2)√6 . . . . square units

3 0
3 years ago
A model of a human heart is 14 ft tall. If the scale used is 1 ft: 1/4 inch, how tall is the actual heart?
Simora [160]
The actual height of the heart is 3.5 inches

14 * .25 = 3.5 inches

I hope this helps :)

6 0
2 years ago
A roof drops 6 feet for every 3 feet forword,determine the slope of the roof the slope can be positive or negative
dalvyx [7]

Answer:

The slope is -2

Step-by-step explanation:

Since the roof is decreasing in height as it goes forward, I know that the slope must be negative. The equation to find the slope is rise/run. The vertical change, or the rise, is -6 feet, so that value goes on top of the fraction. The horizontal value, or the run, is 3 feet so that goes on the bottom of the fraction.

Now our fraction is \frac{-6}{3}

If you simplify that fraction, you'll get -2.

8 0
2 years ago
WILL GIVE BRAINLIEST find the y-intercept of the parabo;a y= -33/4 x^2 + 4
valentinak56 [21]

Answer:

The y-intercept is (0, 4)

  1. Since the y-intercept marks the point where x =0, all that you have to do is substitute 0 in for x in the parabola's equation.

Please Mark Brainliest If This Helped!

6 0
2 years ago
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