he did not factorize it correctly for (9/16n)(9/16n) as there is 9/16n^2 , he had forgotten to square root 9/16, thus it should be 3/4. therefore, (14) 1/4m^2 - 9/16n^2 = (1/2m)(1/2m) - (3/4n)(3/4n) = (1/2m + 3/4n)(1/2m - 3/4n)

(9/16n)(9/16n) is not equal to 9/16n^2 so it should be (3/4n)(3/4n) and the answer should be (1/2m+3/4n)(1/2m-3/4n). I think is a careless mistake as he had done it correctly for 1/4m^2 which basically had the same concept as the 9/16n^2.

Transfer error: 1/4 m^2 becomes1/2 m^2

ReplyDelete1/4m^2 is not equal to 1/2m X1/2m as the square is only for m.

ReplyDeleteThis comment has been removed by the author.

ReplyDelete1/4m^2= (1/4m)(1/4m)=1/16m^2

ReplyDelete1/4m^2 is not equal to (1/2m)^2 as the increase in power is only for the m and not the 1/2.

ReplyDeleteThe 9/16 should be 3/4

ReplyDeletehe did not factorize it correctly for (9/16n)(9/16n) as there is 9/16n^2 , he had forgotten to square root 9/16, thus it should be 3/4. therefore,

ReplyDelete(14) 1/4m^2 - 9/16n^2

= (1/2m)(1/2m) - (3/4n)(3/4n)

= (1/2m + 3/4n)(1/2m - 3/4n)

1/4m^2 - 9/16n^2

ReplyDelete=(1/2m)(1/2m)-(3/4n)(3/4n)

=(1/2m+3/4n)(1/2m-3/4n) #

The 2nd part is wrong it should be

ReplyDelete=(0.5m)(0.5m) - (3/4n)(3/4n)

(9/16n)x(9/16n) is not 9/16n^2

ReplyDeleteAnd therefore the answer should be m^2/4-9n^2/16

(9/16n)(9/16n) is not equal to 9/16n^2 so it should be (3/4n)(3/4n) and the answer should be (1/2m+3/4n)(1/2m-3/4n). I think is a careless mistake as he had done it correctly for 1/4m^2 which basically had the same concept as the 9/16n^2.

ReplyDeleteTransfer ERROR

ReplyDelete-9/16n^2 doesn't equal to -(9/16n)(9/16n)

-9/16n^2 equals to -(3/4n)(3/4n)

-9/16n^2 does not equal to -(9/16n)(9/16n)

ReplyDelete-9/16n^2should be equal to -(3/4n)(3/4n) because it has to be factorised too.

Transfer error.

ReplyDelete-9/16n^2 is not equal to -(9/16n)(9/16n)

-9/16n^2 is equal to -(3/4n)(3/4n)