Answer:
x = ±10
Step-by-step explanation:
4x² - 400 = 0
Add 400 to both sides
4x² = 400
Divide both sides by 4
x² = 100
Take the square root of both sides
x = ±10
Answer:
45
Step-by-step explanation:
Hope this helps.
value of x is
and value of y is ![y=-\frac{9}{2}](https://tex.z-dn.net/?f=y%3D-%5Cfrac%7B9%7D%7B2%7D)
Step-by-step explanation:
We need to find Which expression could be substituted for y in the second equation to find the value of x
The given equations are:
![2x-y=-10\,\,\,(1)2x - 3y= -1\,\,\,\,(2)](https://tex.z-dn.net/?f=2x-y%3D-10%5C%2C%5C%2C%5C%2C%281%292x%20-%203y%3D%20-1%5C%2C%5C%2C%5C%2C%5C%2C%282%29)
For putting value of y in second equation, we will find from equation 1
From equation 1:
![2x-y=-10\\-y=-10-2x\\y=10+2x](https://tex.z-dn.net/?f=2x-y%3D-10%5C%5C-y%3D-10-2x%5C%5Cy%3D10%2B2x)
Putting value of y i.e y=10+2x in equation (2) to find value of x
![2x-3y=-1\\2x-3(10+2x)=-1\\2x-30-6x=-1\\-4x=-1+30\\-4x=29\\x=\frac{29}{-4}\\x=-\frac{29}{4}](https://tex.z-dn.net/?f=2x-3y%3D-1%5C%5C2x-3%2810%2B2x%29%3D-1%5C%5C2x-30-6x%3D-1%5C%5C-4x%3D-1%2B30%5C%5C-4x%3D29%5C%5Cx%3D%5Cfrac%7B29%7D%7B-4%7D%5C%5Cx%3D-%5Cfrac%7B29%7D%7B4%7D)
So, now finding value of y by putting value of x= -29/4 in eq(1)
![2x-y=-10\\2(-\frac{29}{4})-y=-10\\-\frac{29}{2}-y=-10\\-y=-10+\frac{29}{2}\\ -y=\frac{-20+29}{2}\\ -y=\frac{9}{2}\\ y=-\frac{9}{2}](https://tex.z-dn.net/?f=2x-y%3D-10%5C%5C2%28-%5Cfrac%7B29%7D%7B4%7D%29-y%3D-10%5C%5C-%5Cfrac%7B29%7D%7B2%7D-y%3D-10%5C%5C-y%3D-10%2B%5Cfrac%7B29%7D%7B2%7D%5C%5C%20-y%3D%5Cfrac%7B-20%2B29%7D%7B2%7D%5C%5C%20-y%3D%5Cfrac%7B9%7D%7B2%7D%5C%5C%20y%3D-%5Cfrac%7B9%7D%7B2%7D)
So, value of x is
and value of y is ![y=-\frac{9}{2}](https://tex.z-dn.net/?f=y%3D-%5Cfrac%7B9%7D%7B2%7D)
Keywords: System of equations
Learn more about System of equations at:
#learnwithBrainly
Answer:
Since this means f of g so I will get the function g(x) and replace it with X in the function of f (x)
To start off with you need to get math-way it will help out