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ACT Math: Algebra

SAT Question of the Day

The SAT question of the day is a Geometry question that has already been addressed on this blog: click here to see an explanation.

ACT Question of the Day

The ACT question of the day is a math question that requires you to understand algebra.

Start by reading the question carefully.  Notice that it does not ask you for a solution to an equation.  Instead it asks how many solutions there are to this equation.  Many of you will realize immediately that this is a quadratic equation, so there are two solutions.  If you do not immediately recognize this, simply solve the equation for the variable x.

x2 - 15 = 0
x2 = 15

At this point you could find the exact square root of 15, but you don't have to.  Why not?  Whenever you take the square root of a number, you know that you will have one positive number and one negative number.  That means that there are two solutions!

The correct answer is (H).

To get help preparing for the SAT, PSAT, or ACT exam, check out the Knowsys College Readiness Program.

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