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The work shown below was marked
wrong by the teacher. Identify the
mistake (clearly state what it was) and
correct it (what should have been done
instead?).
Problem: Factor the equation and find
the x-intercepts of
y = 3x2 – 2x - 8
Solution:
-24
-6
4
-2
y = 3x2 - 6x + 4x - 8
y = 3x(x - 2) + 2(2x – 4)
Conclusion:
Since the terms in the parenthesis
are not the same, this equation
cannot be factoradatharafora thaceara