A-Level Maths B5-26 [Inequalities: Representing Quadratic Inequalities Graphically]

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When using a calculator to solve quadratic should we write down the root and y intercept to show we used a calculator or can we just draw graph as is without showing any proof?

imraniqbal
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This might seem like a dumb question but On the first one, when y=0 doesn’t x^2 = -1 but -1 can’t be square number so I don’t understand this bit

bobkhan