Question

b. C = {x : x

2 + 7x – 8 = 0, x ∈ R} write in roster form ​

Answer 1

Please see the attachment

Answer 2

The roaster form of $C=\{x:x^2+7x-8=0, x\in \mathbb{R}\}$ is C={1,-8}.

Step-by-step explanation:

Given : Set  $C=\{x:x^2+7x-8=0, x\in \mathbb{R}\}$

To find : Write in roaster form ?

Solution :

To write a set in roster form, all you have to do is list each element of the set, separated by commas, within a pair of curly braces.

Solving the equation,

$x^2+7x-8=0$

$x^2+8x-x-8=0$

$x(x+8)-1(x+8)=0$

$(x-1)(x+8)=0$

$x=1,-8$

The roaster form of $C=\{x:x^2+7x-8=0, x\in \mathbb{R}\}$ is C={1,-8}.

#Learn more

Write in roaster form:

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