Question

(a+b)²-4ab=
please help me for my exam​

Answer 1

Answer:

$\huge \boxed{ \boxed{(a - {b)}^{2} } }$

Step-by-step explanation:

to understand this

you need to know about:

• algebra

tips and formulas:

• algebraic identity:(a-b)²=(a+b)²-4ab

let's solve:

therefore

using the identity our answer is (a-b)²

let's prove it

1. (a-b)²:a²-2ab+b²
2. rewrite -2ab as 2ab-4ab:a²+b²+2ab-4ab
3. use (a+b)²=a²+2ab+c²:(a+b)²-4ab

therefore

we have also proven that