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Nataliya [291]
3 years ago
5

How many times does X squared minus 4X -12 cross the X axis

Mathematics
1 answer:
kolbaska11 [484]3 years ago
4 0

We can solve this problem using discriminant.

x^2-4x-12's discriminant is

(-4)^2-4*-12=16+48 which is clearly larger than 0

This means that it crosses over the axes 2 times.

In case you don't know what discriminant is, its in equation ax^2+bx+c

the discriminant is b^2-4ac.

If its positive it has 2 crosses with x axis, if negative then 0 crosses, if 0 then 1 cross.

Hope this helped at least a little bit :D

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What is one solution to the system of equations graphed here?
Yakvenalex [24]

Answer:

(-2, 4)

Step-by-step explanation:

Hello!

There are two solutions for this system, which can be found by looking at the intersections of the two graphs.

The first intersection is at point (-2, 4), and the second one is at point (4, -3).

Since the second option is not a given option, it is the last option (-2, 4).

8 0
2 years ago
Find the zeros of the function h(x)=x^2-5x-50 by factoring
lukranit [14]
h(x)=x^2-5x-50=x^2-5x-25-25=x^2-25-5x-25\\\\=(x^2-25)-(5x+25)=(x^2-5^2)-5(x+5)\\\\=(x-5)\underline{(x+5)}-5\underline{(x+5)}=(x+5)(x-5-5)=(x+5)(x-10)\\\\Answer:Zeros\ are\ x=-5\ and\ x=10.
5 0
4 years ago
Vincente slept 5 more hours this past weekend than Dorinda. Dorinda only slept half as many hours this weekend as Sade.
Ahat [919]

Answer/Step-by-step explanation:

<em><u>*An average person on Earth needs 8.5 hours of sleep each night*</u></em>

1. V - 5 = D

2. D ÷ 2 = S

3. S + 5 = V

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4 0
3 years ago
Given l(-4,3) and m(-7,-2), what's the length of lm
Sergeeva-Olga [200]
Distance = Square Root ( (X difference)^2<span> + (Y difference)^</span>2<span> )
</span>
Distance = Square Root ( (-4 --7)^2 + ( 3 --2)^2<span> )

</span>Distance = Square Root (3^2 + 5^2)

<span>Distance = Square Root (9 + 25)

Distance = </span><span>Square Root (34)

Distance = </span><span>5.8309518948

Therefore the length of lm equals </span> <span> <span> <span> 5.8309518948 </span> </span> </span>


3 0
3 years ago
I need help please.
tatuchka [14]

Answer:

63.17

Step-by-step explanation:

add all the numbers together which gives you 379

then 379 by how many numbers there are.

there are 6 numbers so divide 379 by 6 which equals 63.16666667

and if you round to the nearest hundredth it gives you 63.17

3 0
3 years ago
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