DenizYildirim

1 Questions
2 Answers

0

958

2

+8

Expanding Brackets

I was doing some maths revision and the clip I was watching told me the following:
(2y+1)^2 = 4y^2+4y
I understand how the 4y^2 part was achieved but I don't get how or where the +4y bit comes from.
Can someone please help me.
-Thanks read more ..

DenizYildirim Jun 12, 2012

+8

0

Ah thank you!
I keep forgetting when something in brackets is squared it's essentially two of the same brackets multiplied by each other.

DenizYildirimJun 12, 2012

+8

0

11x+8=8x+17

Take away 8x from both sides

11x+8-8x=8x+17-8x

3x+8=17

Shift 8 to the other side of the equation thus making it negative

3x=17-8
17-8 =9 so:

3x=9

Divide by 3 on both sides of the equation

3x/3=9/3

Which means:
x=3

DenizYildirimJun 12, 2012