You should have kind of guessed that the second question is actually trying to test you using the method in first part to solve second question...That kind of method you did we won't know if you used calculator or not also...

you need to use the method of (a) to solve (b). If you do not, we can just press the calculator and that does not know we know the skills. So, no marks are given

(a+b)(a-b) = a^2 - b^2 not other things.

ReplyDeleteOwen here.

It is supposed to be -b^2 as it is a +b multiplied by -b

ReplyDeleteThe second question should make use of algebra to find the answer .

ReplyDeleteYou should have kind of guessed that the second question is actually trying to test you using the method in first part to solve second question...That kind of method you did we won't know if you used calculator or not also...

ReplyDelete- b x b = -b^2

ReplyDeletenegative and positive = negative.

It should be -b^2 instead as -b* b = -b^2

ReplyDeleteIt should be -b^2 as negative x positive = negative

ReplyDeletesuppose to be -b^2 since its -b mutliply by b

ReplyDeleteIt should have been -b^2 as -b x b = -b^2

ReplyDeleteFor the second part, the numbers can represent a letter.

a = 100

b = 5

You can substitue the numbers thus, you can get -b^2.

it should be a^2+ab-ab-b^2 instead of what is stated

ReplyDelete7b should make use of the equation in 7a, as the question states hence, which is referring to 7a

ReplyDelete7a should be -b^2. 7b should make use of 7a to find the solution

ReplyDeleteYou must use part a to help solve

ReplyDelete1st ERROR: -b x b = -b^2, not b^2

ReplyDelete2nd ERROR: Use the method in a) to solve b)

b(-b)=-b^2

ReplyDeletePart (b) should be solved using (a+b)(a-b)-a^2

Question 7a should be -(b^2). You should make use of 7a to help find the answer in 7b.

ReplyDeleteas it is hence - you must use a method related to (a) to answer the question

ReplyDeleteYou should be using the solution in (a) to solve (b) because they used the word HENCE

ReplyDelete(a+b)(a-b) = a^2 - b^2

ReplyDeleteyou need to use the method of (a) to solve (b).

If you do not, we can just press the calculator and that does not know we know the skills. So, no marks are given

1. -b x b = -b^2 not b^2

ReplyDelete(a) The term b^2 should be -b^2 when expanded.

ReplyDelete(b) He did not make use of the answer in (a) to solve the question.