Answer
$(1+x)(2-x)-(3-x)(3+x)=x-7$
Work Step by Step
$(1+x)(2-x)-(3-x)(3+x)$
Evaluate both products and simplify:
$(1+x)(2-x)-(3-x)(3+x)=...$
$...=(2-x+2x-x^{2})-(9-x^{2})=...$
$...=-x^{2}+x+2+x^{2}-9=...$
$...=x-7$
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