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ramyani chakrabarty (3105)

Blazing goIITian

total posts: 2537
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let y= x² + 2x + 1
or, x² + 2x + (1 - y) = 0
now if x is real,
D>=0
or, 4 - 4(1 - y)>=0
or,1-1+y>=0
or, y>=0
so, minimun value of x²+ 2x +1 is 0
maximum value can also be found out like this.

if a>=1 the given euation will hav minimum value an din other cases it will hav maximun value.

for drawing the graph of the expression, the following way may help:
let y= x² + 2x + 1

now for evry value of x u get a value of y.plot them in the graph paper and u get ur graph.

rate me plz if it helps

NIT silchar electrical engineering

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