## Elementary Algebra

To multiply complex numbers, we multiply each term of the first number by each term of the second number and then simplify. $(5+i)(5-i)$ $5(5)+5i-5i+i(-i)$ Let us simplify the expression: $25-i^2$ Since $i^2=-1$, we can rewrite the expression as: $25-(-1)$ When we subtract, we get $26$, which is not $24$.