-3 [8 - 3 (5 + sqrt(9)) - ( 7 - 9)] =
- -42
- 42
- 60
Explanation from PART66Online
Work from the innermost brackets: 5 + sqrt(9) = 8, so 3 x 8 = 24, and (7 - 9) = -2. The bracket becomes 8 - 24 - (-2) = -14, and -3 x -14 = 42. Mishandling the double negative gives the -42 distractor.
L
lewis_d54 asked · 27 Sep 2013
Explain?
Community Comments (10)
P
PART66Online
27 Sep 2013
Hello.
What to explain here? Please tell how you are calculating this question, step by step. After that we will tell you where you are wrong.
What to explain here? Please tell how you are calculating this question, step by step. After that we will tell you where you are wrong.
L
lewis_d54
27 Sep 2013
I've tried numerous ways and I can't get the answer 42. If someone could show me their working out I can see where I went wrong . Thanks
P
PART66Online
27 Sep 2013
By basic rules of math first you must calculate what is in inner brackets. After that you must calculate what is in outer brackets. Remember what multiplication and division has priority over addition and subtraction.
-3 [8 - 3 (5 + √9) - ( 7 - 9)] =
-3 [8 - 3 * 8 - (-2)] =
-3 [8 - 24 + 2] =
-3 * (-14) = 42
-3 [8 - 3 (5 + √9) - ( 7 - 9)] =
-3 [8 - 3 * 8 - (-2)] =
-3 [8 - 24 + 2] =
-3 * (-14) = 42
L
lewis_d54
27 Sep 2013
Thanks I got to -3 [8 - 24 + 2] but was basically doing -3 [8 - (24 + 2)] = -3*(-18)
I understand now cheers for the help
I understand now cheers for the help
P
PART66Online
27 Sep 2013
You welcome.
You can buy a Training DVD. There is all materials what you need to rise up your math skill, and other modules too of course. :)
You can buy a Training DVD. There is all materials what you need to rise up your math skill, and other modules too of course. :)
F
Farman Mughal
21 Dec 2013
42
R
Richiegeee
26 Jan 2015
How do we get -14?
following BODMAS, I get 24 + 2 = 26 and 8 - 16 = -18.
following BODMAS, I get 24 + 2 = 26 and 8 - 16 = -18.
A
andyrhcp104
8 Jun 2015
Is anyone else seeing this???:
-3 [8 - 3 (5 + and#8730;9) - ( 7 - 9)] =
-3 [8 - 3 (5 + and#8730;9) - ( 7 - 9)] =
P
PART66Online
9 Jun 2015
Hey andyrhcp104, there was issue with encoding, now it is fixed.
A
andyrhcp104
12 Jun 2015
Thanks Dimky
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