Math Problem Statement

одно число меньше другого

Одно число меньше другого на 57, а их произведение равно -740. Найди эти числа.

Solution

The task in the image is asking to find two numbers that meet the following conditions:

  1. One number is 57 less than the other.
  2. The product of these two numbers is -740.

Let the two numbers be xx and yy, where xx is the larger number. According to the problem, we have:

x=y+57x = y + 57

and

xy=740x \cdot y = -740

Substituting x=y+57x = y + 57 into the second equation:

(y+57)y=740(y + 57) \cdot y = -740

Expanding this:

y2+57y=740y^2 + 57y = -740

Rearranging the equation:

y2+57y+740=0y^2 + 57y + 740 = 0

Now, we solve this quadratic equation. The general formula for solving a quadratic equation ay2+by+c=0ay^2 + by + c = 0 is:

y=b±b24ac2ay = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

For the equation y2+57y+740=0y^2 + 57y + 740 = 0, a=1a = 1, b=57b = 57, and c=740c = 740. Let's calculate the discriminant and find the values of yy. math

Coefficients of the quadratic equation

a = 1 b = 57 c = 740

Calculate the discriminant

discriminant = b**2 - 4ac

Calculate the solutions using the quadratic formula

if discriminant >= 0: root1 = (-b + math.sqrt(discriminant)) / (2a) root2 = (-b - math.sqrt(discriminant)) / (2a) else: root1 = root2 = None

(root1, root2)The solutions to the quadratic equation are:

y=20ory=37y = -20 \quad \text{or} \quad y = -37

Now, we can find the corresponding values for xx using x=y+57x = y + 57.

For y=20y = -20: x=20+57=37x = -20 + 57 = 37

For y=37y = -37: x=37+57=20x = -37 + 57 = 20

Thus, the two pairs of numbers are:

  1. 3737 and 20-20
  2. 2020 and 37-37

These are the two solutions that satisfy the conditions. The first pair is 3737 and 20-20, and the second pair is 2020 and 37-37.

Would you like further clarification on this? Let me know if you have any questions or would like to explore related problems!


Here are 5 related questions:

  1. How do you solve a quadratic equation using the quadratic formula?
  2. What happens if the discriminant in a quadratic equation is negative?
  3. Can the product of two numbers ever be negative if both numbers are positive or both negative?
  4. How do you interpret the roots of a quadratic equation in terms of the problem context?
  5. How can you verify that the values of xx and yy satisfy the given conditions in a word problem?

Tip: When solving quadratic equations, always check whether the discriminant is positive, zero, or negative, as this determines the nature of the roots (real or complex).

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Product of Numbers

Formulas

x = y + 57
x * y = -740

Theorems

Quadratic Equation Formula
Factorization

Suitable Grade Level

Grades 7-9