Firstly is (2x-5)(x+3) equal to 2x^2+x-15? Just wanna make sure im getting this right.

Simultaneous Equations

Ive forgotten how to do them and the sites ive looked at arent too helpful. Could you explain how to do it with algebra instead of using graphs like ive seen

x+3y=5

3x-y=5

I know x is 2 and y is 1 but how would you work it out.

Also 2x=3y-2

3y=1+4x

What can y^2-1

------ be simplfied to?

y^2-y-2

What are the solutions to 2x^2-11x+15=0 and 3x^2-2x+4=0?

Last one! :P

Simplify (Sqrt)12x(Sqrt)8x(Sqrt)98

and

Mulitply (2-(Sqrt)3)(1+3(Sqrt)3)

If you wouldnt mind explaining how you did them that would save me asking next time

Thanks a lot.