\(-\frac{4}{5}\)
\(-\frac{2}{5}\)
4
5
Correct answer is A
m * n = \(\frac{mn}{2}\)
Identify, e = 2
Let a \(\in\) R, then
a * a\(^{-1}\) = e
a * a\(^{-1}\) = 2
-5 * a\(^{-1}\) = 2
\(\frac{-5 \times a^{-1}}{2} = 2\)
\(a^{-1} = \frac{2 \times 2}{-5}\)
\(a^{-1} = -\frac{4}{5}\)
The distance between two towns is 50km. It is represented on a map by 5cm. Find the scale used ...
If x =3, y = 2 and z = 4 what is the value of \(3x^{2}-2y+z\)...
Solve the simultaneous equations y = 3x; 4y - 5x =14 ...
The identity element with respect to the multiplication shown in the diagram below is \(\begin{...
If 3214 is divided by 234 and leaves a remainder r, what is the value of r?...
Simplify: \(\frac{3}{4} \div 1\frac{1}{4} \times (1\frac{1}{2} - \frac{2}{3})\)...