![Khan Academy practice test #5: no calculator Q10, answer is B. I understand how to simplify to 4(a^2+2ab+b^2) but nothing past that. : r/Sat Khan Academy practice test #5: no calculator Q10, answer is B. I understand how to simplify to 4(a^2+2ab+b^2) but nothing past that. : r/Sat](https://preview.redd.it/g1nkfyaaxq891.jpg?auto=webp&s=e85d36d70faf2ef3038e899c2b4ff0e575c1275c)
Khan Academy practice test #5: no calculator Q10, answer is B. I understand how to simplify to 4(a^2+2ab+b^2) but nothing past that. : r/Sat
![Equilibrium constant for the reaction, A2 + B2 2AB , at a given temperature is 2 while is the degree of dissociation for A2 is: Equilibrium constant for the reaction, A2 + B2 2AB , at a given temperature is 2 while is the degree of dissociation for A2 is:](https://dwes9vv9u0550.cloudfront.net/images/2101456/66ae2fdf-84fb-42e1-a098-522b360aa8d7.jpg)
Equilibrium constant for the reaction, A2 + B2 2AB , at a given temperature is 2 while is the degree of dissociation for A2 is:
![Algebraic Identities (a-b)2 = a2-2ab+b2 Proof | Why a - b whole square is equal to ..| VipraMinds - YouTube Algebraic Identities (a-b)2 = a2-2ab+b2 Proof | Why a - b whole square is equal to ..| VipraMinds - YouTube](https://i.ytimg.com/vi/QzHCsslxIlo/sddefault.jpg)
Algebraic Identities (a-b)2 = a2-2ab+b2 Proof | Why a - b whole square is equal to ..| VipraMinds - YouTube
![Handheld Student's Scientific Calculator 2 Line Display Portable Multifunctional Calculator For Mathematics Teaching Ne | Fruugo AT Handheld Student's Scientific Calculator 2 Line Display Portable Multifunctional Calculator For Mathematics Teaching Ne | Fruugo AT](https://img.fruugo.com/product/4/87/177456874_max.jpg)
Handheld Student's Scientific Calculator 2 Line Display Portable Multifunctional Calculator For Mathematics Teaching Ne | Fruugo AT
We knew that (a-b) ^2 = a2-2ab+b2. For example,(a-7) ^2 = a2-7a+49.My question is why don't we consider the negative on the 7 in the expression? I mean '-7' times 'a' is -
![using the formula (a-b)2=(a2-2ab+b2),evaluate (196)2, (689)2 ,(891)2 - Maths - Linear Equations in Two Variables - 14395159 | Meritnation.com using the formula (a-b)2=(a2-2ab+b2),evaluate (196)2, (689)2 ,(891)2 - Maths - Linear Equations in Two Variables - 14395159 | Meritnation.com](https://s3mn.mnimgs.com/img/shared/content_ck_images/ck_c4642b5eb673806bf26fe57d2ec25370.png)