Step-by-step explanation:
The third option: 5x(x^2+3)(4x-5)
because FOIL first, inner, outter, last
The two parentheses become (4x^3-5x^2+12x)
then 5x outside multiplys that whole parentheses. To get your correct expression
Answer: 39
Step-by-step explanation: you have to plug in -4 into each x so that would be f(-4)=2(-4)(2)+7(-4)(3)-8(-4)(2)-21(-4)+7= 39
Let's solve for i.
9x + 7i <3 (3x+7u)
First add -9x to both sides.
7i + 9x + −9x < 21u + 9x + −9x
7i < 21u
Then Divide both sides by 7.
7i/7 < 21u/7
The answer is i < 3u
The answer is true I hope I helped