Algebra

Could have put a bit more examples.

4 is wrong

It's a little patronising! I say a little I mean A LOT!!!!

i have osteoperosis

(2X + 3Y) (4X + 7Y) = 8X^2 + 26XY + 21Y^2

If you are adding (which you are) you do not place the brackets around the equations and you places a + between them.

4 is wrong

thanks for putting this on here im literally useless at doing algebra and this helped a lot :)