Name: SAT Math Help & School Math Mastery
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#38680

algebra

expressions

hard

90 sec

If $(x^{2} + A)^{2} + (x - B) (x + B)$ simplifies to $x^{4} + 15 x^{2} + 40$ , where $A$ and $B$ are positive constants, what is the value of $A + B$ ?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.