T-QAD Day 15 @ 3 May 2020

Notes Topic: QUADRATIC EQUATIONS

Subtopic:

Before you start with the revision, please download the module below.
If possible, print the module. IF NOT, just copy and try to do the questions.

Module: Quadratic Equations

(i)        Quadratic Equation and its roots

(ii)       Solving Quadratic Equations

·       

      The general form of quadratic equation is ax² + bx + c = 0, where a, b and c are constants. a¹0 and x is unknown.

·       The roots of the quadratic equation can be determined by:

o   Factorisation

o   Completing the square

o   Quadratic formula

·        

  

Question 1 : Q1/D15/030520

Solve the quadratic equation k² – k – 12 = 0 by completing the square.

                                                                                   
                                                                                                  (4 marks)

Question 2 : Q2/D15/030520

The diagram shows a polygon ABCDE such that AB = AE = 5x cm, CD = 8x cm and DE = (x + 4) cm. If the area of the polygon is 84 cm²,

(a) show that 5x² + 8x – 21 = 0,                                             (3 marks)

(b) find the length of wire needed to form the polygon.        (5 marks)

                                                                                  

Answers T-QAD 30 April 2020

Check your answer and fill in the form to record your marks.

MyMarks