IGCSE QUADRATIC FORMULAE

These are questions on quadratic formulae

Transcript

1. Name: Exam Style Questions Quadratic Formula Equipment needed: Calculator, pen Guidance 1. Read each question carefully before you begin answering it. 2. Check your answers seem right. 3. Always show your workings Video Tutorial www.corbettmaths.com/contents Video 267 Answers and Video Solutions © Corbettmaths 2023
2. 1. Write down the quadratic formula. x = .................................................. (1) 2. Solve the equation x 2 + 5x + 1 = 0 Give your answers to one decimal place. x = ..................... or x = ..................... (3) 3. Solve the equation 2x 2 + 6x + 1 = 0 Give your answers to two decimal places. x = ..................... or x = ..................... (3) © Corbettmaths 2023
3. 4. Solve the equation 4x 2 + x − 7 = 0 Give your answers to two decimal places. x = ..................... or x = ..................... (3) 5. Solve the equation x 2 − 2x − 9 = 0 Give your answers to two decimal places. x = ..................... or x = ..................... (3) 6. Solve the quadratic equation 7x 2 − 25x + 2 = 0 Give your answers to two decimal places. .................................................................... (3) © Corbettmaths 2023
4. 7. Solve the equation 3x 2 + 10x + 5 = 7 Give your answers to two decimal places. .................................................................... (3) 8. Solve the equation 11x 2 = 7 − 2x Give your answers to two decimal places. .................................................................... (3) 9. Solve the equation 12x 2 − 13x + 4 = 13x 2 − 5x + 1 Give your answers to one decimal place. .................................................................... (3) © Corbettmaths 2023
5. 10. A rectangular field is 15m longer than it is wide. The area of the field is 800m² Work out the length of the field. Give your answer to 1 decimal place. .....................m (4) 11. Shown above is a right angled triangle. (a) Show that x 2 − x − 14 = 0 (3) (b) Find x. .....................cm (3) © Corbettmaths 2023
6. 12. Solve, giving your answers to two decimal places. 7 = m + 10 m+9 m = ..................... or m = .................... (3) 13. Shown is a triangle with area 19cm². Find the value of x .................................................................... (4) © Corbettmaths 2023
7. 14. Jack is solving a quadratic equation in the form x 2 + bx + c = 0 He has got to this point in his working out x= 5± 2 53 Find the values of b and c. b = ……………………… c = ……………………… (3) © Corbettmaths 2023
8. 15. The area of the shape below is 100cm² (a) Show that 8x 2 − 15x − 113 = 0 (3) (b) Find the perimeter of the shape .....................cm (5) © Corbettmaths 2023