Everytime something is multiplied by 0 you always get zero, That is pretty much it....
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you make x=0 and solve for y. for the x intercept you do y=0 and solve for x
x=-6+6=0 then x=-2+2=0 and 0+0=0
No. If you let 'x' =0 then 'x' is zero and there's no reason to solve for it.At the x-intercept ... just like at any point on the x-axis ... 'y' is zero.Let 'y' equal zero, then solve for 'x'.
Set it equal to 0 and subtract x and solve for y
factorise (x-5)(x+4)=0 Hence x= 5 or -4