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WEEK EIGHT

TOPIC: ROOTS OF QUADRATIC EQUATION 1

SUB-TOPICS:

  • Quadratic equation (completing the square and formula method).
  • Sum and product of roots of quadratic equation.
  • Finding quadratic equation given sum and product of roots, x2 – (sum of roots) + (product) = 0.
  • Condition for quadratic equation to have: (i) Equal roots (b2 = 4ac) (ii) Real roots b2 > 4ac (iii) No roots b2 < 4ac

SUB-TOPIC 1

Quadratic equation (completing the square and formula method).

A quadratic equation (trinomial) in one variable is a three termed equation in which the highest power of the variable is two. The general quadratic equation in variable x is of the form ax2 + bx + c = 0 where a ≠ 0.

In general, a quadratic equation has two solutions which may or may not b+e equal.

There are four major methods of solving quadratic equations. They are:

  • factorization method;
  • completing the square method;
  • formula method;
  • graphical method.

Factorisation

Examples

Solve the following by factorization

  1. x2 -2x – 8=0
  2. 15x2 + 14x – 8=0

Solution

(a) Product of 1st and 3rd term = -8x2

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