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Intersection

If A=x:x2-3...

Question

If $A = {x : x^{2} - 3 x + 2 = 0}$ and $B = {x : x^{2} + 4 x - 5 = 0}$ then the value of $A - B$ is

{1, 2}

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{2}

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{1}

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{5, 2}

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Solution

The correct option is A ${2}$
$A = {x : x^{2} - 3 x + 2 = 0} ⟹ A = {1, 2}$
$B = {x : x^{2} + 4 x - 5 = 0} ⟹ A = {1, - 5}$
$∴ A - B = {2}$

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B

=

x : x^{2} - 3 x + 2 = 0

R

A

R

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