McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
Study Guide and Review
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Exercise 10 Page 217

Use the given roots to write the equation in factored form. Then multiply and simplify to obtain the standard form.

Example Solution: 4x^2+5x+1=0

Practice makes perfect

We can write a quadratic equation in factored form using the given roots. Then we will change it to standard form by multiplying the factors. Factored Form:& a(x-p)(x-q)=0 Standard Form:& ax^2+bx+c=0 In the factored form, p and q are the roots of the equation. Since we are told the roots are - 14 and - 1, we can partially write the factored form of our equation. a( x-( - 1/4 ) ) ( x-( -1))=0 ⇕ a( x+ 1/4 ) ( x+1)=0 Since a does not have any effect on the roots, we can choose any value. For simplicity and in order to have integer coefficients, we will let a=4. This is a common multiple of both denominators of the given roots and will allow us to eliminate the fractions when we distribute. 4( x+ 1/4 ) ( x+1)=0 Finally, let's use the Distributive Property to obtain the standard form.

4( x+ 1/4 ) ( x+1)=0
(4x+1)(x+1)=0
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Multiply parentheses
4x(x+1)+ 1(x+1)=0
4x^2+4x+ 1(x+1)=0
4x^2+4x+ x+1=0
4x^2+5x+1=0

Please note that this is just one example of a quadratic function that satisfies the given requirements.