using matlab to solve plotting function -


i've been asked plot function f(x) = (x^2 - 3x + 7) / (sqrt(2x +5))

for -1< x <5

how go starting this?

thanks all

matlab works arrays (matrices actually). first, need create array x values: 

x = -1: 0.01: 5

where 0.01 interval between consecutive values.

then need calculate y values. 

y = (x.^2 - 3*x + 7) ./ (sqrt(2*x + 5));

this quite straightforward. thing need notice dots. .*, ./ operators work element-wise (which need, since want calculate square of values). if instead typed x^2, mean matrix multiplication of x itself, produce wrong values in case.
finally, plot it: 

plot(x, y, '.b');

x , y obvious. last part refers color , style of line. in case mean blue dots. other styles see matlab line styles.


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