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kobusy [5.1K]
3 years ago
6

What is the sum? 8 + (negative 12) –20 –4 4 20

Mathematics
2 answers:
brilliants [131]3 years ago
6 0

Answer:

-4

Step-by-step explanation:

Romashka-Z-Leto [24]3 years ago
3 0

8 + (-12)

= 8 - 12

= -4

Because a + - makes a -

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F(x)=2x^2-x-10 part a: what are the X intercepts of the graph of f(x)? Show your work
Genrish500 [490]
A. x intercepts are where the graph hits the x axis or where f(x)=0
0=2x^2-x-10
solve
hmm
we can use the ac method
multiply 2 and -10 to get -20
what 2 numbers muliply to get -20 and add to get -1 (the coefint of the x term)
-5 and 4
split the midd into that
0=2x^2+4x-5x-10
group
0=(2x^2+4x)+(-5x-10)
factor
0=2x(x+2)-5(x+2)
undistribute
0=(x+2)(2x-5)
set each to 0
0=x+2
0=-2

0=2x-5
5=2x
5/2=x

x intercepts are at x=-2 and 5/2 or the points (-2,0) and (5/2,0)


B. ok, so for f(x)=ax^2+bx+c
if a>0, then the parabola opens up and the vertex is a minimum
if a<0 then the parabola opens down and the vertex is a max

f(x)=2x^2-x-10
2>0
opoens up
vertex is minimum

ok, the vertex

the x value of  the vertex in f(x)=ax^2+bx+c= is -b/(2a)
the y value of the vertex is f(-b/(2a)) so
given
f(x)=2x^2-x-10
a=2
b=-1
-b/2a=-(-1)/(2*2)=1/4
f(1/4)=2(1/4)^2-(1/4)-10
f(1/4)=2(1/16)-1/4-10
f(1/4)=1/8-1/4-10
f(1/4)=1/8-2/8-80/8
f(1/4)=-81/8
so the vertex is (1/4,-81/8) or (0.25,-10.125)


C. graph the x intercepts and the vertex
the vertex is min and the graph goes through the x intercepts
4 0
3 years ago
I need help I don’t understand this at all
Alina [70]

Answer:

it is 60

Step-by-step explanation:

1= what, well its 60

7 0
2 years ago
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What divided by what equals 18
deff fn [24]
18/1 36/2 72/4 ...and many more....
8 0
3 years ago
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I ONLY NEED THE ANSWER FOR C. THE OTHER TWO ARE CORRECT. PLEASE HELP :(
Xelga [282]

Answer:

1.2 I think sorry if I'm wrong double check to see

Step-by-step explanation:

This is what I thought of oof so sorry if it incorrect

7 0
2 years ago
A to the power of 0 multiply by A to the power of 6
alukav5142 [94]

Answer:

just a

Step-by-step explanation:

because if you do anything times by zero, it is zero.

6 0
3 years ago
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