The only way to solve if it is equal to something
assuming that the teacher wanted you to make it equal to zero do
0=-3x^2-21x-54
remember if we can do
xy=0 then assume x and y=0
so factor
0=-3x^2-21x-54
undistribute the -3
0=-3(x^2+7x+18)
remember 0 times anything=0 so
x^2+7x+18 must equal zero
use quadratice formula which is
if you have
ax^2+bx+c=0 then
x=
![\frac{-b+/- \sqrt{b^{2}-4ac} }{2a}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-b%2B%2F-%20%5Csqrt%7Bb%5E%7B2%7D-4ac%7D%20%7D%7B2a%7D%20)
x^2+7x+18
a=1
b=7
c=18
x=
![\frac{-7+/- \sqrt{7^{2}-4(1)(18)} }{2(1)}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-7%2B%2F-%20%5Csqrt%7B7%5E%7B2%7D-4%281%29%2818%29%7D%20%7D%7B2%281%29%7D%20)
x=
![\frac{-7+/- \sqrt{49-72} }{2}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-7%2B%2F-%20%5Csqrt%7B49-72%7D%20%7D%7B2%7D%20)
x=
![\frac{-7+/- \sqrt{-23} }{2}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-7%2B%2F-%20%5Csqrt%7B-23%7D%20%7D%7B2%7D%20)
i=√-1
x=
![\frac{-7+/- i\sqrt{23} }{2}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-7%2B%2F-%20i%5Csqrt%7B23%7D%20%7D%7B2%7D%20)
the zerose would be
x=
![\frac{-7+ i\sqrt{23} }{2}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-7%2B%20i%5Csqrt%7B23%7D%20%7D%7B2%7D%20)
or
I wanna say B but i don’t remember i had that question before though
Answer:
Fish
Step-by-step explanation:
i ate the fish
Answer:
I am assuming you are asking for what percent correct she got. She got 46% correct.
Step-by-step explanation:
You divide the answers correct by the total questions. She got 69 out of 150, so dividing that is .46
To turn a decimal into a percentage, just move the decimal two places to the right, thus getting 46 %
If I assumed what you were asking incorrectly, let me know and I'll be happy to help!
Step-by-step explanation:
substitude the y value into y in the first equation
-8-(12x-50)=30
-8-12x+50=30
you see it?
then solve
-8+50-30=12x
you got the value = 12x
then you divide with 12
finally you get x