Question

find the x-intercepts of f(x)=4x^2-20

Answer 1

x intercepts occur when y or f(x) = 0.
so 0 = 4x^2 - 20
4x^2 = 20
x^2 = 5
\[x = \sqrt{5}\]
or
\[x = -\sqrt{5}\]

Answer 2

That's the answer I got when solving 4x^2=20. So the x-intercepts are the same as the solution to the equation?

Answer 3

the x-intercept is not the solution to the function f(x) = 4x^2 - 20. it's only the solution when f(x) = 0.

Answer 4

Part a) " Solve 4x^2=20 "
Part b) Find the x-intercepts of f(x)=4x^2-20

Part a) answer is the same answer you gave for the function

Answer 5

Ahh the answer to part b) should be ( sqrt5,0) (-sqrt5, 0)