x(x+3)(x+6)(x+9)+56
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1
Answer:
x4+18x3+99x2+162x+56
Step-by-step explanation:
Given
x(x+3)(x+6)(x+9)+56
x(x2+6x+3x+18)(x+9)+56
= x(x3+9x2+6x2+54x+3x2+27x+18x+162)+56
=x( x3+18x2+99x+162)+56
=x4+18x3+99x2+162x+56
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