Because

x

^{2}+ 4xy + 4y

^{2} - xy - 2y

^{2}
= x

^{2} + 3xy + 2y

^{2 }
But it's not properly factoried so I'm unsure about it?

The next one was factorise: 4x

^{2}+ 2x + 1

I'm confused because

1 and 1 = 2 and 2 (*2) = 4 or 0 - not 2

4 and 1 (*4 and *1) = 5 or 3 - also not 2

and neither of these combinations work so I don't know what else to do?

And the last one is solve: (1/49)

^{-1/2 }
I know that it means square root of 1/1/7 because the power

^{1/2 }= square root and the - means 1 over but 1/1/7 isn't a rational number and when I try turning it into a decemal it goes on forever and because it would be 1/0.143 (rounded) its still not a rational number so I am incredibly confused and would really apreciate help..? By the way I'm not aloud to use a calculator so could you please explain without one?