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Name:___________________________________________________Grade & Section:_______________ 
SOLVING QUADRATIC EQUATIONS 
Casio FX 991 MS Calculator 
Instruction: 
*Press Mode when you want to solve equation. 
EQN ………….…………………………… 
*Entering EQN Mode and pressing displays the initial quadratic equation screen 
*Press 2 for quadratic equation and input values for each of the coefficient. 
*You can use the and keys to move between coefficients on the screen and make changes, 
if you want. 
*Pressing the key returns to the coefficient input screen. 
Example: To solve the equation 
푥2 − 7푥 + 10 = 0 (푥 = 5, 2 ) 
(Degree?) 2 
(푎? ) 1 
(푏? ) 7 
(푐? ) 10 
(푥1 = 5) 
(푥2 = 2) 
Find the roots of the following equations. 
1.) 3푥2 − 10푥 − 8 = 0 푥 = ____________ 
2.) 3푥2 + 13푥 − 10 = 0 푥 = ____________ 
3.) 푥2 + 2푥 − 15 = 0 푥 = ____________ 
4.) 푢2 − 4푢 − 12 = 0 푢 = ____________ 
5.) 6푥2 − 푥 − 12 = 0 푥 = ____________ 
6.) 2푦2 − 7푦 + 13 = 0 푦 = ____________ 
7.) 3푎2 − 6 = 17푎 푎 = ____________ 
8.) −20푥 − 3 = 25푥2 푥 = ____________ 
9.) 2푥2 + 푥 = 6 푥 = ____________ 
10.) 36푎2 + 9푎 = 10 푥 = ____________ 
Prepared By: Caryl Mae S. Puertollano
ANSWER KEY 
Find the roots of the following equations. 
1.) 3푥2 − 10푥 − 8 = 0 푥 = − 
2 
3 
, 4 
2.) 3푥2 + 13푥 − 10 = 0 푥 = 
2 
3 
, -5 
3.) 푥2 + 2푥 − 15 = 0 푥 = -5 , 3 
4.) 푢2 − 4푢 − 12 = 0 푢 = 6, -2 
5.) 6푥2 − 푥 − 12 = 0 푥 = − 
4 
3 
, 
3 
2 
6.) 2푦2 − 7푦 + 3 = 0 푦 = 
1 
2 
, 3 
7.) 3푎2 − 6 = 17푎 푎 = − 
1 
3 
, 6 
8.) −20푥 − 3 = 25푥2 푥 = − 
3 
5 
, − 
1 
5 
9.) 2푥2 + 푥 = 6 푥 = 
3 
2 
, -2 
10.) 36푎2 + 9푎 = 10 푎 = − 
2 
3 
, 
5 
12

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Paper 4 puertollano

  • 1. Name:___________________________________________________Grade & Section:_______________ SOLVING QUADRATIC EQUATIONS Casio FX 991 MS Calculator Instruction: *Press Mode when you want to solve equation. EQN ………….…………………………… *Entering EQN Mode and pressing displays the initial quadratic equation screen *Press 2 for quadratic equation and input values for each of the coefficient. *You can use the and keys to move between coefficients on the screen and make changes, if you want. *Pressing the key returns to the coefficient input screen. Example: To solve the equation 푥2 − 7푥 + 10 = 0 (푥 = 5, 2 ) (Degree?) 2 (푎? ) 1 (푏? ) 7 (푐? ) 10 (푥1 = 5) (푥2 = 2) Find the roots of the following equations. 1.) 3푥2 − 10푥 − 8 = 0 푥 = ____________ 2.) 3푥2 + 13푥 − 10 = 0 푥 = ____________ 3.) 푥2 + 2푥 − 15 = 0 푥 = ____________ 4.) 푢2 − 4푢 − 12 = 0 푢 = ____________ 5.) 6푥2 − 푥 − 12 = 0 푥 = ____________ 6.) 2푦2 − 7푦 + 13 = 0 푦 = ____________ 7.) 3푎2 − 6 = 17푎 푎 = ____________ 8.) −20푥 − 3 = 25푥2 푥 = ____________ 9.) 2푥2 + 푥 = 6 푥 = ____________ 10.) 36푎2 + 9푎 = 10 푥 = ____________ Prepared By: Caryl Mae S. Puertollano
  • 2. ANSWER KEY Find the roots of the following equations. 1.) 3푥2 − 10푥 − 8 = 0 푥 = − 2 3 , 4 2.) 3푥2 + 13푥 − 10 = 0 푥 = 2 3 , -5 3.) 푥2 + 2푥 − 15 = 0 푥 = -5 , 3 4.) 푢2 − 4푢 − 12 = 0 푢 = 6, -2 5.) 6푥2 − 푥 − 12 = 0 푥 = − 4 3 , 3 2 6.) 2푦2 − 7푦 + 3 = 0 푦 = 1 2 , 3 7.) 3푎2 − 6 = 17푎 푎 = − 1 3 , 6 8.) −20푥 − 3 = 25푥2 푥 = − 3 5 , − 1 5 9.) 2푥2 + 푥 = 6 푥 = 3 2 , -2 10.) 36푎2 + 9푎 = 10 푎 = − 2 3 , 5 12