Math Problem Statement

Write a standard form quadratic equation whose solutions are 3/2 and 5/8

Solution

To write a quadratic equation given its solutions (also called roots), you can use the factored form of the quadratic equation:

a(xr1)(xr2)=0a(x - r_1)(x - r_2) = 0

Where r1r_1 and r2r_2 are the roots of the equation.

In this case, the given solutions are 32\frac{3}{2} and 58\frac{5}{8}. Therefore, we can write the equation as:

a(x32)(x58)=0a(x - \frac{3}{2})(x - \frac{5}{8}) = 0

We can expand this equation step by step:

Step 1: Multiply the two binomials

First, expand (x32)(x58)(x - \frac{3}{2})(x - \frac{5}{8}):

(x32)(x58)=x2(32+58)x+(3258)(x - \frac{3}{2})(x - \frac{5}{8}) = x^2 - \left(\frac{3}{2} + \frac{5}{8}\right)x + \left(\frac{3}{2} \cdot \frac{5}{8}\right)

Now, simplify the coefficients:

  1. 32+58=128+58=178\frac{3}{2} + \frac{5}{8} = \frac{12}{8} + \frac{5}{8} = \frac{17}{8}
  2. 3258=1516\frac{3}{2} \cdot \frac{5}{8} = \frac{15}{16}

So the expanded expression is:

x2178x+1516x^2 - \frac{17}{8}x + \frac{15}{16}

Step 2: Clear the fractions

To eliminate the fractions, multiply the entire equation by 16 (the least common denominator):

16(x2178x+1516)=016(x^2 - \frac{17}{8}x + \frac{15}{16}) = 0

Distribute the 16:

16x234x+15=016x^2 - 34x + 15 = 0

Final Answer:

The quadratic equation in standard form is:

16x234x+15=016x^2 - 34x + 15 = 0

Would you like further details on any of the steps? Let me know if you need additional explanations.


Related questions:

  1. How do you find the solutions of a quadratic equation using the quadratic formula?
  2. How do you factor a quadratic equation like x27x+10=0x^2 - 7x + 10 = 0?
  3. How do you convert a quadratic equation from factored form to standard form?
  4. What are the conditions for a quadratic equation to have real or complex solutions?
  5. What is the discriminant, and how does it help in identifying the nature of the roots of a quadratic equation?

Tip: Always check the solutions of the quadratic by substituting them back into the original equation to confirm they satisfy it!

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Factored Form to Standard Form
Roots of Equations

Formulas

Factored form: a(x - r1)(x - r2) = 0
Expanding binomials: (x - r1)(x - r2) = x^2 - (r1 + r2)x + (r1 * r2)

Theorems

Properties of Quadratic Equations

Suitable Grade Level

Grades 8-10