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3 years ago

Is -x the same thing as -1

Mathematics

2 answers:

Anestetic [448]3 years ago

8 0

Yes, it is because x basically means 1, so -x is the same thing as 1

MissTica3 years ago

4 0

Answer:

Well lets say this.

U have an equation, down below

x + -2x=6

If you try and solve this You would want to find X, but theirs no number in front of x so it might be hard for you to figure out...But... There is always an invisible 1 in front of the X

So you have -x and -1 and your wondering if there the same

I would say NO because there is a 1 infront of the -x and you just have -1 if it was -1x and -1x then yes it would be the same!

Sorry if this didnt make any sense but I hope I helped!!

Step-by-step explanation:

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Answer: C

Step-by-step explanation:

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3 years ago

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3 years ago

Help with question 14!!

maria [59]

Answer: a=2 b=5 c=-7

parabola equation is y = 2x^2+5x-7 = 0

Step-by-step explanation:

Substitute (x,y) into y = a x^2 + b x + c

(2,11) 11 = 4a + 2b + c

(-1,-10) -10 = a - b + c

(-4,5) 5 = 16a -4b + c

Solve the linear system in a, b, c

Det[{{4,2,1},{1,-1,1},{16,-4,1}}] = 54

Det[{{11,2,1},{-10,-1,1},{5,-4,1}}] = 108

Det[{{4,11,1},{1,-10,1},{16,5,1}}] = 270

Det[{{4,2,11},{1,-1,-10},{16,-4,5}}] = -378

a = 108/54 = 2

b = 270/54 = 5

c = -378/54 = -7

parabola equation is y = f(x) = 2x^2+5x-7

f(2) = 8+10-7 = 11 ✔

f(-1) = 2-5-7 = -10 ✔

f(-4) = 32-20-7 = 5 ✔

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