Math Problem Statement

The sum of two numbers is 12 and the difference of their squares is 60. The difference between the numbers is

(A) 3

(B) 5

(C) 7

(D) 9

Solution

Let the two numbers be xx and yy.

Given:

  • The sum of the two numbers: x+y=12x + y = 12
  • The difference of their squares: x2y2=60x^2 - y^2 = 60

Step 1: Use the identity for the difference of squares:

x2y2=(xy)(x+y)x^2 - y^2 = (x - y)(x + y) Substituting the given values: (xy)(12)=60(x - y)(12) = 60

Step 2: Solve for xyx - y:

xy=6012=5x - y = \frac{60}{12} = 5

Thus, the difference between the numbers is 5\boxed{5}.

Would you like more details on any part of this solution?


Here are 5 related questions:

  1. What is the product of the two numbers?
  2. How do you find the numbers given x+y=12x + y = 12 and xy=5x - y = 5?
  3. What is the sum of the squares of the two numbers?
  4. How would the solution change if the sum was different?
  5. Can you solve this problem geometrically?

Tip: The difference of squares formula is a useful tool for simplifying expressions in algebra.

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Math Problem Analysis

Mathematical Concepts

Algebra
Difference of Squares
Linear Equations

Formulas

x^2 - y^2 = (x - y)(x + y)
x + y = 12
x - y = 60 / 12

Theorems

Difference of Squares Theorem

Suitable Grade Level

Grades 8-10