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NikAS [45]
3 years ago
15

Simplify the following expression.

Mathematics
1 answer:
Charra [1.4K]3 years ago
6 0

Answer: 14y

Step-by-step explanation:

7 times 2 = 14

7 times 5 = 35

14y + 35z - 35z

35 - 35 = 0

You are left with 14y

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What are the coordinates of the x-intercepts of the parabola y = x² - 8x + 15?
tamaranim1 [39]

Answer:

(3, 0) and (5, 0)

Step-by-step explanation:

we have

y=x^{2}-8x+15

we know that

The x-intercepts are the values of x when the value of y is equal to zero

so

For y=0

x^{2}-8x+15=0

The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

is equal to

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

in this problem we have

x^{2}-8x+15=0  

so

a=1\\b=-8\\c=15

substitute in the formula

x=\frac{-(-8)\pm\sqrt{-8^{2}-4(1)(15)}} {2(1)}

x=\frac{8\pm\sqrt{4}} {2}

x=\frac{8\pm2} {2}

x=\frac{8+2} {2}=5

x=\frac{8-2} {2}=3

so

x=3, x=5

therefore

The x-intercepts are (3,0) and (5,0)

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3 years ago
John has a bag of red and blue marbles. John chooses 2 marbles without replacing the first.
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Answer:

Step-by-step explanation:

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The equation v/2 -21=-15 is solved in several steps below.
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Answer:

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Step-by-step explanation:

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