Week 1: Student Response to Discussion

Collapse SubdiscussionSarah Woods

Jun 4, 2017Jun 4 at 12:09pm

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To evaluate each expression, I started out by writing down my birthday, 6/15/94 and then I wrote down the problems keeping in mind the variables a, b, and c; my problems looked like this, 6^3 - -15^3, (6- -15) [6^2+6(-15) + -15^2] and (-15 – 94)/ [2(-15) – 6]. To start on the first problem, I broke down each number and wrote it like this, 6 X 6 X 6 + 15 X 15 X 15, I did this because the exponent of each number was 3. I then did the multiplication and got this, 216 + 3,375. Lastly, I added the two remaining numbers and got 3,591. For my second problem, I started by changing (6 - - 15) into (6 +15) because a positive minus a negative is a positive. I then made [6^2 +6(-15) + -15^2] into [36(-90) + 225]. After doing this I added my first two numbers and got 21. I then did 36(-90) and got -3,240; bringing my problem to look like this, (21) (-3,240 + 225). To finish off the problem I first added -3,240 and 225 resulting in – 3,015; I then multiplies (21) (-3.015) and got for my result -63,315. For my last problem, I did not get an integer for my final answer but I did get the lowest terms for the answer I got. To start off I wrote the problem as I did with all the expressions, I then did (-15 – 94) getting -109 and [2(-15) – 6] resulting in -30 – 6. Now I have a problem that looks like this, -109/ -30 – 6; I keep the -109 and I subtract the -30 and the 6, getting -36. Now my problem looks like, -109/ -36. The – 36 is the divisor in this problem. The answer I got was -3.027 and I reduced it to -3.03.