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
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 -
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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
42. Which of the following is correct? A. a-b2=a2+ - Gauthmath
32. a-b2= a a2+b2 b a2-b2 c a2-2ab+b2 d a2+2ab+b2 - Gauthmath