Question

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Example 1 Write the solution set of the equation x² + x - 2 = 0 in roster form.
Solution The given equation can be written as
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Answer 1

Answer:

{1,-2}

Explanation:

To find the solution of the above equation in roster form, we need to factorise it.

x2+2x-x-2 = 0

x(x+2)-1(x+2)

(x+2) (x-1)

x = -2 or x = 1

Roster form: {1,-2}

Answer 2

Answer:

{1,-2}

Explanation:

To find the solution of the above equation in roster form, we need to factorise it.

x2+2x-x-2 = 0

x(x+2)-1(x+2)

(x+2) (x-1)

x = -2 or x = 1

Roster form: {1,-2}