Express the given complex number in the form \(a + ib: 3(7 + i7) + i(7 + i7)\)
Solution and Explanation
3(7 + i7) + i(7 + i7)
=21+21i +7i+7i2
=21+28i-7
=14+28i (Ans.)
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Concepts Used:
Complex Numbers and Quadratic Equations
Complex Number: Any number that is formed as a+ib is called a complex number. For example: 9+3i,7+8i are complex numbers. Here i = -1. With this we can say that i² = 1. So, for every equation which does not have a real solution we can use i = -1.
Quadratic equation: A polynomial that has two roots or is of the degree 2 is called a quadratic equation. The general form of a quadratic equation is y=ax²+bx+c. Here a≠0, b and c are the real numbers.
