SOLUTION: Would like help checking the answers to a quadratic equation. My initial 2x^2+3x=14 Answers are x= -7/2 and x= 2. I am not sure how to check these. Thank you in advance.

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Would like help checking the answers to a quadratic equation. My initial 2x^2+3x=14 Answers are x= -7/2 and x= 2. I am not sure how to check these. Thank you in advance.      Log On


   

Question 720290: Would like help checking the answers to a quadratic equation.
My initial 2x^2+3x=14
Answers are x= -7/2 and x= 2. I am not sure how to check these.
Thank you in advance.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
You are correct on both. Nice work.

To check them, you just plug them back in and see if they satisfy the original equation

Checking x = -7/2

2x^2+3x=14

2(-7/2)^2+3(-7/2)=14

2(49/4)+3(-7/2)=14

98/4-21/2=14

98/4-42/4=14

(98-42)/4=14

(56)/4=14

14 = 14 ... which is TRUE

So x = -7/2 satisfies the equation, which means x = -7/2 is a solution



Checking x = 2

2x^2+3x=14

2(2)^2+3(2)=14

2(4)+3(2)=14

8 + 6=14

14 = 14 ... which is TRUE

So x = 2 satisfies the equation, which means x = 2 is a solution

So both answers check out.