Simplify the expression (8+i)(2+7i)

Given : (8 + i)(2 + 7i)

⇒ (8 × 2) + (8 × 7i) + (i × 2) + (i × 7i)

⇒ 16 + 56i + 2i + 7i²

We know that i² = -1

⇒ 16 + 58i + 7(-1)

⇒ 16 + 58i - 7

⇒ 9 + 58i

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

i dont know

step-by-step explanation:

umm. i dont know