Answer :

eunice1234

Answer: OPTION B

Step-by-step explanation:

First of all, you need to know the concept of imaginary number or i.

i (imaginary number)= √-1 ⇔ In real number world, √-1 will be undefined,  

                                               and thus this is called imaginary number

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√-2=√2 × √-1

  • √2=√2
  • √-1= i

√-2=√2× √-1

√-2=√2 × i

√-2= √2 i

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√-18=√9 × √2 × √-1

  • √9=3 ⇒ This is a perfect square
  • √2=√2
  • √-1=i

√-18= √9 × √2 × √-1

√-18= 3 × √2 × i

√-18= 3√2 i

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Addition in radical numbers is as usual as normal number. HOWEVER, only numbers that has the same radical (i.e 2√3 and 7√3) can combine.

 √-2 + √-18

=√2 i + 3√2 i

=4√2 i

Hope this helps!! :)

Please let me know if you have any question

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