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Plot the graph of $f(x) = 3x^2+6x+3$ for $x \in [-3,3]$
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its a quadratic graph which is cup shaped as coefficient of x^2 is positive

let x=0 to get y-intercept

let y=0 to get two x-intercepts by factorizing or use of quadratic formula

then plot the points, within -3 and +3 x value interval and join them to produce a smooth curve
by Diamond (80.1k points)

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