Core Connections Algebra 1, 2013
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Core Connections Algebra 1, 2013 View details
2. Section 11.2
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Exercise 33 Page 537

Practice makes perfect
a We will use the Quadratic Formula to solve the given quadratic equation.
ax^2+ bx+ c=0 ⇕ x=- b± sqrt(b^2-4 a c)/2 aLet's start by rewriting the equation so all of the terms are on the left-hand side of the equation.
2x^2=2-3x
2x^2+3x=2
2x^2+3x-2=0
Now, we can identify the values of a, b, and c. 2x^2+3x-2=0 ⇕ 2x^2+ 3x+( - 2)=0 We see that a= 2, b= 3, and c= - 2. Let's substitute these values into the Quadratic Formula.
x=- b±sqrt(b^2-4ac)/2a
x=- 3±sqrt(3^2-4( 2)( - 2))/2( 2)
â–Ľ
Solve for x and Simplify
x=- 3±sqrt(9-4(2)(- 2))/2(2)
x=- 3±sqrt(9-8(- 2))/4
x=- 3±sqrt(9+16)/4
x=- 3±sqrt(25)/4
x=- 3± 5/4
The solutions for this equation are x= - 3± 54. Let's separate them into the positive and negative cases.
x=- 3± 5/4
x_1=- 3+ 5/4 x_2=- 3- 5/4
x_1=2/4 x_2=- 8/4
x_1=1/2 x_2=- 2

Using the Quadratic Formula, we found that the solutions of the given equation are x_1= 12 and x_2=- 2.

b We want to find the real solutions of the given quadratic equation. Let's begin by isolating the square on one side. Here, this means subtracting 4 from both sides of the equation.

(2x-3)^2+4=0 ⇔ (2x-3)^2= - 4 Notice that there is no real number that results in a negative number when squared. Since - 4 <0, there is no real number that can satisfy the given quadratic equation. Therefore, this equation has no real solutions.