Ok so i have this problem , i know this topic has been written about before cos i have read all the info i could find!! But im still stumped on this one.
The question is y= (x+1)(X-2)
The answer says domain is all real numbers and rane is all real numers greater than -2.25
Im lost as to how that -2.25 came up.
the function is quadratic, hence the graph of y is a parabola that opens upward in this case. the y-value of the vertex of the parabola is the least value in the range.
Originally Posted by el123
y = (x + 1)(x - 2)
the vertex is located at x = 0.5, midway between the two roots of the function.
the y-value of the vertex is y = (0.5 + 1)(0.5 - 2) = (1.5)(-1.5) = -2.25
Huzzahh!! Thank you Skeeter.