-10x^2-4x+18
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See, the equation is of a parabola which will open downwards.
differentiating w.r.t. x , we get the maximum value of y:
dy/dx=0=-20x-4
x=-1/5
y=-10x^2-4x+18=18.4
hence, range =(-infinity,18.4)
differentiating w.r.t. x , we get the maximum value of y:
dy/dx=0=-20x-4
x=-1/5
y=-10x^2-4x+18=18.4
hence, range =(-infinity,18.4)
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negative infinity to positive infinity
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+infinity to - infinity
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y<=18.4