Question

hw to solve the quadratic equation

Answer 1

friend first of all you open tube and type our question and open first

Answer 2

First, factorise the quadratic equation x2- 9x + 20 = 0

Find two numbers which add up to 9 and multiply to give 20. These numbers are 4 and 5.

(x - 4) (x - 5) = 0

Now find the value x so that when these brackets are multiplied together the answer is 0.

This means either (x - 4) = 0 or (x - 5) = 0

So x = 4 or x = 5.

You can check these answers by substitutuing 4 and 5 in to the equation:

x2- 9x + 20

Substituting 4 gives:

42 - 9 × 4 + 20 = 16 - 36 + 20 = 0

Substituting 5 gives:

52 - 9 × 5 + 20 = 25 - 45 + 20 = 0

Remember these 3 simple steps and you will be able to solve quadratic equations.