Question

If a² + b² = 21 and ab = 2 , then find the value of ( a + b )
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Answer 1

$We \: know \: (a+b) ^2=a^2+b^2+2ab \\ Acc. \: to \: ques, \\ (a+b) ^2=21+2(2) \\ (a+b) ^2=21+4 \\ (a+b) ^2=25 \\ a+b=\sqrt{25} \\ a+b=5$

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Answer 2

Answer:

strong intermolecular forces.

particles vibrate in place.

low kinetic energy (KE)

definite shape.

definite volume.

incompressible.

high density (as compared to same substance as a liquid or gas)

low rate of diffusion (millions of times slower than in liquids)