The student used a calculator
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7b) Is wrong because the question asked for without the use of the calculator.
he used calculator instead he should use algebra
Umm... He/She used a calculator.
He/She should not use a calculator
The student is not following the method '(a+b)(a-b)-a^2'
7b is wrong because the person uses the calculator when the question specifies not to use the calculator because it is hard to calculate such a big value without the use of the calculator.
The question stated without the use of a calculator, but the person used a calculator for this, and did not use the algebra method.
The student was using a calculator but not a method without a calculator to solve the question
He used the calculator to solve the answer, which can be inferred through (9975-10000) whereas he should have used the algebraic manipulation or expressions given in 7(a)
This is wrong because, the person should have used the same method he/she used for the question above.
Clearly can be seen that calculator is being used.
did not show how to get 9975
He should not use calculator, he should use the method from the prev question
The person must have used a calculator
How did he get 9975? Calculator? No working too. :P
he did not show his working on how he got his answer 9975
The person might have forgot to bring calculator, so he thought nothing was wrong by just doing it manually... Anyway, the person didn't apply algebra to it, and used a "calculator".
He did not use the algebra method to do the sum.
He did not use the algebra method to do the question and used the calculator.
He or she used a calculator instead of using the formula above.
Ok i understand now thanks! >.<I could have assume that x is 100 So when the question asked 105x95=100^2If 'x' was 100 then my question would become:(x+5)x(x-5)-x^2then i could solve it :D