please solve all of the above questions of accounts class 12
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To Prove : (a+b+c)(a−b+c)=a2+b2+c2
Proof : a,b,c are in continued proportion.
∴ ba=cb=k (let)
b=ck
a=bk=(ck)k =ck2
L.H.S. =(ck2+ck+c)(ck2−ck+c)
=c2(k2+k+1)(k2−k+1)
=c2[(k2+1)2−(k)2]
=c2[k4+2k2+1−k2]
=c2[k4+k2+1]
R.H.S. =c2k4+c
Construct a line segment AB of length 7.5 cm. From this line segment, cut off a line
segment AC of length 3.2 cm. Measure the length of the remaining line segment CBWhich force is used by doctors to remove a very tiny iron filing from the eye of patient?Which one is not an example of contact force?
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