4x² +16x
4x (x+4) is your answer
you can divide a 4 and a x from they polynomial
hope this helps
4/5. 16/20.
.................
X+y=217. x+y=217
x-y=85. 151+y=217
-----------. y=217-151
2x=302. y=66
x=151
Answer: 7/8
Cos2x has 3 formulas, Sinx is given in the question, we should use the formula with sinus. I guess that's the solution.
The answer is 16, good luck