90, 75% is also .75 and .75*120 is 90
Answer:
Family a because it is more chronological
Step-by-step explanation:
ANSWER
No solution
EXPLANATION
The first equation is
![y = {x}^{2} - 2x](https://tex.z-dn.net/?f=y%20%3D%20%20%7Bx%7D%5E%7B2%7D%20%20-%202x)
and the second equation is
![y = - 2x - 1](https://tex.z-dn.net/?f=y%20%3D%20%20-%202x%20%20-%201)
We equate the two equations to obtain;
![{x}^{2} - 2x = - 2x - 1](https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B2%7D%20%20-%202x%20%3D%20%20-%202x%20-%201)
This implies that
![{x}^{2} = - 2x + 2x - 1](https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B2%7D%20%20%3D%20%20-%202x%20%2B%202x%20-%201)
![{x}^{2} = - 1](https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B2%7D%20%20%3D%20%20-%201)
There is no real number whose square is -1.
Therefore, the equation has no solution.
Answer:
Step-by-step explanation:
Don't be fooled by this. We can make this look like the equations you have been factoring up to now. Let
x^3 = y Square both sides of the equation
(x^3)^2 = y^2
x^6 = y^2
Now substitute these results into the given equation.
y^2 + 6y + 5 = 0
This factors
(y + 5)(y + 1) = 0
So either y + 5 = 0
or y + 1 = 0
y+5 = 0
x^3 + 5 =0
x = cuberoot(-5)
x^3 + 1 = 0
x^3 = - 1
cube root (x^3) = cube root (-1)
x = - 1
Essentially the graph shows that there are only 2 roots (-1,0) (-1.71,0) just as our solution suggests.