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DIS Veteran
- Joined
- Aug 29, 2011
My son just finished some Grade 9 math homework. I double-check his answers and make him re-do any questions he answered incorrectly. Thanks to the text book examples (and answers in the back that he doesn't seem to have figured out yet), so far I can refresh my own memory and explain what he did wrong/how the equation works if he cannot come up with the correct formula/answer.
This one question has me stumped however. The book says the answer is 24. He and I are coming up with a different answer.
Substitute the given values into each expression. Then, evaluate the expression.
x = -6 for this question
x^2 - 2x - 24
This is what we get:
-6^2 - (2 x -6) - 24
-(6x6) - (2 x -6) - 24
-36 - (-12) - 24
-24 - 24
0
What are we doing wrong?
This one question has me stumped however. The book says the answer is 24. He and I are coming up with a different answer.
Substitute the given values into each expression. Then, evaluate the expression.
x = -6 for this question
x^2 - 2x - 24
This is what we get:
-6^2 - (2 x -6) - 24
-(6x6) - (2 x -6) - 24
-36 - (-12) - 24
-24 - 24
0
What are we doing wrong?