The value of the given expression is 65.
The given expression is (4-7i)(4+7i).
A complex number is the sum of a real number and an imaginary number. A complex number is of the form a + ib and is usually represented by z.
Here,
By using distributive property, we get
(4-7i)(4+7i)
= 4(4+7i)-7i(4+7i)
= 16 + 28i - 28i - 49i²
= 16 - 49(-1)
= 16 + 49
= 65
Therefore, the value of the given expression is 65.
To learn more about the complex numbers visit:
https://brainly.com/question/10251853.
#SPJ1
