Question

if u= a+b , v=a-b ,|a|=|b|=2 then|uxv|=

Answer 1

Answer:

ryiuotuksuksurutuetuuooetuei

Answer 2

Answer:

Step-by-step explanation:

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MATHS

If

u

=

a

−

b

;

v

=

a

+

b

&

a

=

b

=2, then ∣

u

×

v

∣ is equal to:

January 17, 2020

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Bhavya Karkera

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ANSWER

∣

a

∣=

∣

∣

∣

∣

​

b

∣

∣

∣

∣

​

=2

∣

u

×

v

∣

u

×

v

=(

a

−

b

)×(

a

+

b

)

=

a

×(

a

+

b

)−

b

×(

a

+

b

)

=

a

×

a

+

a

×

b

−[

b

×

a

+

b

×

b

]

=

a

×

b

−

b

×

a

u

×

v

=2(

a

×

b

)

∣

u

×

v

∣=2

∣

∣

∣

∣

​

a

×

b

∣

∣

∣

∣

​

(∣

u

×

v

∣)

2

=∣u∣

2

∣v∣

2

−(u.v)

2

∣

u

×

v

∣=

∣u∣

2

∣v∣

2

−(u.v)

2

​

=2

∣a∣

2

∣b∣

2

−(a.b)

2

​

=2

(2)

2

(2)

2

−(a.b)

2

​

=2

16−(a.b)

2

​