Algebra

When faced with an unusual or hard quadratic equation problem, some people waste a lot of time while trying to ‘split the middle term’. The common refrain is ‘I am just not good at it.’ Actually, difficult quadratic problems have […]

Even after working extensively on absolute value questions, sometimes students come up with “why?” i.e. why do we have to take positive and negative values? Why do we have to consider ranges etc. They know the process but they do […]

Today we will discuss an algebra question on sequences in detail and look at two different approaches – one without using Geometric Progression formula and another with the formula. As I said before, you can solve every sequence question on […]

Sometimes, our given inequalities involve multiple signs such as . How do we handle these complex inequalities? To put it simply – one at a time. This is nothing but two inequalities put together so we can pull them apart for […]

We have talked about knowing which numbers to plug-in in case you want to use the number–plugging method. To be more exact, we discussed that you need to find the transition points i.e. the points where the two sides of […]

Let’s discuss the concept of transition points. This is especially useful in questions where you are tempted to plug in values. A question often asked is: how do I know which values to plug and how do I know that […]

If you have been practicing GMAT questions for a while, you will realize that not every question can be solved using pure algebra, especially at higher levels. There will be questions that will require logic and quite a bit of […]

Let’s discuss the basics of factorials today. Once we do, we will see that most factorial expressions can be easily solved using a single method: taking common! First of all, what is ()? … Let’s take some examples:  (mind you, […]

Let’s look at a sequences question today. Check out the previous post that introduces sequences here. It is from GMAT prep test so it is quite indicative of the tricky questions you might get on actual GMAT. Solving the question […]

Today’s Undertaking: Plug-in Method for GMAT We all love to use the plug-in method in Quant questions. We have an equation given and if the options are the possible values of , we just plug in the values and find the […]