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**[SOLVED] please hint me**

**1. Homework Statement**

28. What is the coefficient of [tex]x^{88}[/tex] from

[tex](x+1)(x+2)(x-3)(x+4)(x+5)(x-6)...(x+88)(x+89)(x-90)[/tex].

29. Find x from this equation [tex]\frac{108}{\sqrt{x^2-2916}}=\frac{378-x-\sqrt{x^2-2916}}{x+54}[/tex].

**2. Homework Equations**

**3. The Attempt at a Solution**

**1. Homework Statement**

**2. Homework Equations**

**3. The Attempt at a Solution**