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WINSTONCH [101]
3 years ago
15

Four more than twice a number is 8

Mathematics
2 answers:
lys-0071 [83]3 years ago
6 0
Lets say the number equals x

Four more than twice a number is 8

4 more than twice a number is 8    

4 more than twice x is 8        (twice means 2 times)

4 more than 2x is 8               (more than means to add)

2x + 4 is 8

2x + 4 = 8

2x = 8 - 4

2x = 4

x = 4/2

x = 2
Contact [7]3 years ago
4 0
Four more than twice a number…..the root of this problem is 2. Twice 2 is 2x2 = 4 and then four more that number is 4 + 4 = 8.

Hope this helps. :)
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Use the function f(x) = 4x2 − 7x − 15 to answer the questions. Part A: Completely factor f(x). (2 points) Part B: What are the x
makkiz [27]

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Part B: The x-intercepts are x = 3 and -1.25 #

Part C: As x approaches ∞, y approaches ∞, as x approaches -∞, y approaches ∞

Part D: The graph is a u-shaped quadratic equation graph  passing though the x-intercept points -1.25 and 3 on the x-axis and the y-intercept point -15 on the y-axis. Both sides of the symmetrical graph curve extending to infinity

Step-by-step explanation:

The function 4·x² - 7·x-15

To factorize the expression, we have at the 0 factors;

x = \dfrac{-b\pm \sqrt{b^{2}-4\cdot a\cdot c}}{2\cdot a}

Where;

a = 4, b = -7, c -15, substituting gives;

x = \dfrac{-(-7)\pm \sqrt{(-7)^{2}-4\times 4\times (-15)}}{2\times 4} =  \dfrac{7\pm 17}{8}  = 3 \ or -1.25

Which gives;

(x - 3)·(x + 1.25) = (x - 3)·(4·x + 5)

f(x) = 4·x² - 7·x-15 = (x - 3)·(4·x + 5)

Part B: The x-intercepts are the point where y = 0, which are x = 3 and -1.25 as shown above

Part C: As x approaches ∞, y approaches ∞, as x approaches -∞, y approaches ∞

Part D: With the the nature of the function as y approaches ∞ and -∞ the graph is a u-shaped graph of a quadratic equation passing though the points -1.25 and 3 on the x-axis and the point -15 on the y-axis.

6 0
3 years ago
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Viefleur [7K]

Answer:

the number is 8

Step-by-step explanation:

8-3=5

6•5=30>24

expression: 6(x-3)>24

4 0
2 years ago
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