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Mkey [24]
3 years ago
5

How many x-intercepts does the graph of y = (2x +5)(x −9) 2have? Explain. QUICK PLEASE!

Mathematics
1 answer:
nekit [7.7K]3 years ago
5 0

Answer: 2

Step-by-step explanation:

x-intercepts are points on a graph that lie directly on the x-axis and have 0 as their y-coordinate value. To find the x-intercepts, we just have to replace the y in the equation with 0.

y = (2x+5)(x-9)

0 = (2x+5)(x-9)

<em>Apply zero product rule. </em>

2x+5 = 0  OR  x-9 = 0

x = -\frac{5}{2}  OR x = 9

Thus, the two coordinates of the x-intercepts are: (-\frac{5}{2}, 0) and (9, 0)

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For this question, personally, I would do it algebraically.

So set m to the number of months until they will have the same amount of money. Then you can write an equation matching this scenario, and solve for m as well.

So first, write the side of the equation for Sarah.

She originally had $400, and each month pays $15.

So 400 - 15m for subtracting how much she pays in total, 15m, from her total amount of money, $400.

Now, write the side of the equation for Draius. 

He originally had $50, and he gets $20 each month.

So the equation would be 50 + 20m, for how much he gets in total adding to $50.

Now set the two equal.

400 - 15m = 50 + 20m

Now, move all like terms to opposite sides by using opposite operations.

Subtract 50 from both sides:

400 - 50 - 15m = 50 - 50 + 20m
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So Sarah and Darius will have the same amount of money in 10 months.

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I'll just plug it in for 400 - 15m:

400 - 15 (10)
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And since they'll both have the same amount of money, they'll both have $250. 
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