(a - b)2 + 2ab = ?
1). a2 - b2
2). a2 + b2
3). a2 - 4ab + b2
4). a2 - 2ab + b2
(a - b)2 + 2ab = ?
⇒ ? = a2 + b2 - 2ab + 2ab
∴ ? = a2 + b2
2. If \({2^{x - 1}} + {2^{x + 1}} = 320\), then the value of x is
4. When 70 is subtracted from 25% of a number, the result is 20. What is the value of the number?
5. If x + y + z = 3 and x2 + y2 + z2 = 9, then the value of x3 + y3 + z3 – 3 xyz is?
6. If (7 – 12x) – (3x – 7) = 14, then the value of x is ________.