Question

Mathieu is finding the x-intercepts of the function f(x)=x^2+4x+3. His world is shown below.

(In the photo)


The Answer is:

(He set the factored expressions equal to each other)

I learned that the hard way trial and error >~<

Which error did Mathieu make?

He factored incorrectly.

He did not use the constant as the x-intercept.

(He set the factored expressions equal to each other.)

He incorrectly solved the equation x + 3 = x + 1.

Answer 1

its c

Explanation:

Answer 2

f(x) = x² + 4x + 3

The function intercepts x when y = 0, so, just make the function equals 0

f(x) = 0 = x² + 4x + 3

So, x² + 4x + 3 = 0 and if we factor, x² + 4x + 3 = (x + 3).(x + 1) = 0

And with factoring we know that x intercepts in -3 and -1