Simplify.

−4x2−5(x+3)+x2

−4x2−5x−15

−3x2−5x−15

−9x2−15

−23x

−4x2−5(x+3)+x2= -8-5x-15+2x=-3x-23
−4x2−5x−15=-8x-5x-15=-13x-15
−3x2−5x−15=-6x-5x-15=-11x-15
−9x2−15=-18x-15
i simplified assuming it's an "x"-sign not multiplication
hope this helps 

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8