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How to calculate roots and turning point with no c term?

Sketch the graph of y = -x²+ 7x, clearly indicating any points of intersection with the axes.
I know that the y-intercept is 0 but how would I calculate the roots or the turning point?
Reply 1
You can still factorise that, and do completing the square and differentiate.

If it helps, you can think of c = 0 so that one of the factors has to be (x 0)
(edited 8 months ago)
Reply 2
ohhhhh thank you

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