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-7p2 -2p3 + 5 is an expression, not an equation or inequality. An expression cannot be solved
p4 - 7p2 + p + 1 = p4 - 3p3 + 3p3 - 9p2 + 2p2 - 6p + 7p - 21 + 22 = p3(p -3) + 392(p - 3) + 2p(p - 3) + 7(p - 3) + 22 = (p-3)(p3 + 39p2 + 2p + 7) + 22 So (p4 - 7p2 + p + 1) / (p-3) = (p3 + 39p2 + 2p + 7) + 22/(p - 3)
You convert an (infix) expression into a postfix expression as part of the process of generating code to evaluate that expression.
it is an expression
A more complicated expression.