Add: (3x^3-3x^2+9) and (-7+5x^2+7x^3)

Given expressions are 3x³-3x²+9 and -7+5x²+7x³

On adding them

⇛ (3x³-3x²+9 ) + (-7+5x²+7x³)

⇛ 3x³-3x²+9 -7+5x²+7x³

⇛ (3x³+7x³)+(5x²-3x²)+(9-7)

⇛(3+7)x³+(5-3)x²+(2)

⇛ 10x³+2x²+2

Ans: (3x³-3x²+9 ) + (-7+5x²+7x³) = 10x³+2x²+2

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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