Solve it (x+2)(x+3)(x+4)(x+5)-15
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(x+2)(x+3)(x+4)(x+5)-15=[(x+2)(x+3][(x+4)(x+5)]-15
=(x²+5x+6)(x²+9x+20)-15
=x⁴+9x³+20x²+5x³+45x²+100x+6x²+54x+120-15
=x⁴+14x³+71x²+154x+105
=(x²+5x+6)(x²+9x+20)-15
=x⁴+9x³+20x²+5x³+45x²+100x+6x²+54x+120-15
=x⁴+14x³+71x²+154x+105
Amanj44:
i don't think we were supposed to do that
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