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# FP1 Watch

1. If you a back into 2a+b^2=15 you get b=3 or -3 but mark scheme says -3 which value do you take
https://7cba9babeb0db0ff9468853e0b2d...%20Edexcel.pdf

Question 5b
2. I haven't done the question, but have you noticed a>0?

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I haven't done the question, but have you noticed a>0?

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Yh i noticed that but b is not and can be -3 however the mark scheme says to put it into 2a+2b=0
if you put it into the other equation is can be positive or negative 3
4. If you substitute b=-3 into equation, which value you find for a? You sure it's positive?

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