anonymous
  • anonymous
How do you find the x intercept of y=4x^2-8x+2
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
nincompoop
  • nincompoop
you know the word x-intercept means it is where the line hits the x-axis and that's only possible if the value of y is zero. So why don't you go ahead and solve the equation when the value of y is zero.
nincompoop
  • nincompoop
|dw:1377651765117:dw|
nincompoop
  • nincompoop
|dw:1377651860738:dw|

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

nincompoop
  • nincompoop
@RaWr12321 coocoobird, are you paying attention or you're just going to wait for an answer?
anonymous
  • anonymous
I'm watching
nincompoop
  • nincompoop
watching what? that's all what x-intercept means - the value of y is zero. SOLVE it, coocoo
anonymous
  • anonymous
But you see, I know the answer is 2 plus or minus rad 2 over 2... but when i tried to get to it, i got 1 plus or minus rad 2 over 2..
nincompoop
  • nincompoop
the graph I showed you is just a general demonstration of what an x-intercept meant.
anonymous
  • anonymous
i know what x-intercept means. i just want to know where my mistake was
nincompoop
  • nincompoop
oh okay. show me your solution then
anonymous
  • anonymous
According to the book, i first needed to complete the square so I did, and I got y=4(x-1)^2-2 (which is right because the vertex was correct in the book), then as you said i put in 0 for y.. so its 0=4(x-1)^2-2.. but once i solve that. it turns out to be 1 plus or minus rad 2 over 2
nincompoop
  • nincompoop
Reverse the equality in 0 = 4 x^2-8 x+2 in order to isolate x to the left hand side. 0 = 4 x^2-8 x+2 is equivalent to 4 x^2-8 x+2 = 0: 4 x^2-8 x+2 = 0 Write the quadratic equation in standard form. Divide both sides by 4: x^2-2 x+1/2 = 0 Solve the quadratic equation by completing the square. Subtract 1/2 from both sides: x^2-2 x = -1/2 Take one half of the coefficient of x and square it, then add it to both sides. Add 1 to both sides: x^2-2 x+1 = 1/2 Factor the left hand side. Write the left hand side as a square: (x-1)^2 = 1/2 Eliminate the exponent on the left hand side. Take the square root of both sides: x-1 = 1/sqrt(2) or x-1 = -1/sqrt(2) Look at the first equation: Solve for x. Add 1 to both sides: x = 1+1/sqrt(2) or x-1 = -1/sqrt(2) Look at the second equation: Solve for x. Add 1 to both sides: Answer: x = 1+1/sqrt(2) or x = 1-1/sqrt(2)
nincompoop
  • nincompoop
are you still lost, coocoobird?
nincompoop
  • nincompoop
@rawr12321 are you escaping from your responsibilities?

Looking for something else?

Not the answer you are looking for? Search for more explanations.