Expand: (W - 9)2
We know that,
(a - b)2 = a2 - 2ab + b2
⇒ (W - 9)2 = W2 - 18W + 81
1. The unit digit of (413)243 is
2. The value of x for which the expressions 15x + 4 and 13x - 2 become equal is ______
3. If the unit digit of 2a is 8 where 17 > a > 13. Find the value of a.
4. Sum of a fraction and thrice of its reciprocal is 73/20. What is the fraction?
5. Product of 6ab, 3b and 4a is
9. If x + y + z = 1, x2 + y2 + z2 = 2 and x3 + y3 + z3 = 3, then what is the value of xyz?
10. If x+y+z = 0 , then what is the value of $\frac{x^{2}}{3z}+\frac{y^{2}}{3xz}+\frac{z^{2}}{3x}$