GMAT Error Log (Practice Exams)
Is x > 0?
(1) |x + 3| = 4x - 3
(2) |x + 1| = 2x - 1
I assumed negative signs for the alternative answer for X (absolute value). Both of them being x = 0 for
the alternative answers. Wasn't sure how to make sense of how to answer the question now
I got ....
1) x = 2 or 0
2) x = 2 or 0
Couldn't decide between C, D and E since both pieces have 2 of the same answers.... Correct Answer: 1)
Absolute value equations can have 2 possible values
2) Set right side of the equation with + and then - to get two different answers.
3) TEST THE VARIABLES
5=5
3=-3
Therefore, x = 0 is not a valid solution and 2 is the only possible for solution. Stmt 1 sufficient. Do same
thing with stmt 2 and you get (D) both sufficient.
Why get wrong? cause I didn't know to test cases once you get your variables.
X intercept ? Correct Answer: When y value = 0 OR when line intercepts with the x axis
How to simplify exponents problems Correct Answer: You can split up what's inside the parenthesis and
distribute the exponent.
4^10 = 2^10x2^10
Probability Or vs And Correct Answer: or = + fractions
and = multiply fractions
How to make life easier with TONS of fractions in one problem Correct Answer: Multiply every fraction
by a common denominator to get whole numbers
How to simplify a fraction with a radical in it Correct Answer: Multiply both numerator and
denominator by something to get the number out of the radical
How to find what number to plug in to a given average Correct Answer: add up the total deviations
from the avg, then find the deviation that will make up for it.
Is x > 0?
(1) |x + 3| = 4x - 3
(2) |x + 1| = 2x - 1
I assumed negative signs for the alternative answer for X (absolute value). Both of them being x = 0 for
the alternative answers. Wasn't sure how to make sense of how to answer the question now
I got ....
1) x = 2 or 0
2) x = 2 or 0
Couldn't decide between C, D and E since both pieces have 2 of the same answers.... Correct Answer: 1)
Absolute value equations can have 2 possible values
2) Set right side of the equation with + and then - to get two different answers.
3) TEST THE VARIABLES
5=5
3=-3
Therefore, x = 0 is not a valid solution and 2 is the only possible for solution. Stmt 1 sufficient. Do same
thing with stmt 2 and you get (D) both sufficient.
Why get wrong? cause I didn't know to test cases once you get your variables.
X intercept ? Correct Answer: When y value = 0 OR when line intercepts with the x axis
How to simplify exponents problems Correct Answer: You can split up what's inside the parenthesis and
distribute the exponent.
4^10 = 2^10x2^10
Probability Or vs And Correct Answer: or = + fractions
and = multiply fractions
How to make life easier with TONS of fractions in one problem Correct Answer: Multiply every fraction
by a common denominator to get whole numbers
How to simplify a fraction with a radical in it Correct Answer: Multiply both numerator and
denominator by something to get the number out of the radical
How to find what number to plug in to a given average Correct Answer: add up the total deviations
from the avg, then find the deviation that will make up for it.
