Factorisation gives y=(x-4)(x+1), thus the roots are x=-1 and x=4. Further the minimum is attained at x=3/2 (half way between the roots) and y(3/2) = -25/4. Now draw a nice parabola through (-1,0) , (3/2,-25/4) and (4,0).
My question is kind of basic and stupid... but how in the world do you graph THIS question??
I need someone to walk me through it.
y = x^2 - 3x - 4
Should i factorise it or what?? It seems like iI should know this question but i don't.
Yep that looks right to me. If you have a basic calculator you can put it into table mode, and input the equation. It then gives you the results for any input of .
However, it is easy to calculte without a calculator. Just get take values for , say -5, 0, 5, and stick them into the equation. Work it out, and you will obtain a table of results.
ie.
Take
then,
Therefore,
Do the same for the other values, and then you can plot them.