Enter any two values in the Diamond Problem Calculator — Product, Factor A, Factor B, or Sum — and it solves for the remaining two. Perfect for factoring quadratics and algebra practice, the tool shows you the complete diamond with all four values filled in. Also try the Quadratic Formula Calculator.
Factor A (Left)
--
Factor B (Right)
--
Product (Top)
--
Sum (Bottom)
--
Solution Method
--
A diamond problem (also called an X-problem) is an algebra exercise arranged in a diamond or cross shape with four sections. The top holds the product of the two middle numbers, the bottom holds their sum, and the left and right hold the two factors. The goal is to find the missing values given any two of the four. See also our calculate Substitution Method.
If you know both factors, multiply them to get the product and add them to get the sum. If you know the product and sum, solve the quadratic x² − (sum)x + (product) = 0 to find the two factors. If you know one factor and the product, divide to find the other factor, then add for the sum. If you know one factor and the sum, subtract to find the other factor, then multiply for the product.
Diamond problems are primarily used to teach factoring of quadratic trinomials (ax² + bx + c). By finding two numbers that multiply to 'ac' and add to 'b', students can factor the quadratic. They also build number sense and mental math skills for working with factor pairs.
Yes, absolutely. Negative numbers are very common in diamond problems. For example, if the product is negative, the two factors must have opposite signs. If the product is positive but the sum is negative, both factors are negative. The calculator handles all combinations of positive and negative values. You might also find our calculate Corner Point useful.
Yes, when you know both factors or know one factor along with the product or sum, fractions and decimals work fine. However, when solving for two unknown factors from only the product and sum, the calculator uses the quadratic formula, which may produce irrational results. Integer inputs in this case give the cleanest answers.
They are closely related. The X-method (or diamond method) in factoring trinomials ax² + bx + c uses a diamond where the top is the product 'ac' and the bottom is 'b'. Finding the two side factors that satisfy both conditions is exactly solving the diamond problem, making it a visual aid for the AC factoring method.
You only need to enter exactly two of the four values (Product, Sum, Factor A, Factor B) and the calculator will determine the other two. Enter the two values you know and leave the other two blank. Note: when solving for both factors from product and sum alone, there may be two valid solutions (or none, if the discriminant is negative).
When you provide the product and sum and the calculator solves the quadratic x² − (sum)x + (product) = 0, it's possible the discriminant (sum² − 4×product) is negative. In that case, no real-number factors exist and the calculator will indicate no real solution. This happens when the given product and sum combination cannot be achieved with real numbers.