Mathieu is finding the x-intercepts of the function
f(x) = x2 + 4x + 3. His work is shown belo...
Mathematics, 25.05.2020 19:59 jules8022
Mathieu is finding the x-intercepts of the function
f(x) = x2 + 4x + 3. His work is shown below.
0 = x2 + 4x + 3
0 = (x + 3)(x + 1)
x + 3 = x + 1
x = x โ 2
0 = โ2
There are no x-intercepts.
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.
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