$7i(2-5i)$ Opposite sign, why?

Question

$7i(2-5i)$ Doing it on my own I got $14i - 35i$. But the answer key says it should be + not - like in the original unsolved part. Why does the sign switch?

Answer 1

7i(2-5i) = 7i*2+7i*(-5i)

7i(2) = 14i

7i * (-5i) = -35*i^2 = -35*(-1) = 35

So, the solution is 14i+35