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).

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