Question

2. Efectuați, respectând ordinea efectuării operațiilor:
(3x - 1)– 2(x + 2)² +3(1 – x)(1+x).
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Answer 1

(3x-1)-2(x+2)²+3(1-x)(1+x)=

=3x-1-2(x²+2•2x+2²)+(3-3x)(1+x)=

=3x-1-2x²-8x-8+3(1+x)-3x(1+x)=

=3x-1-2x²-8x-8+3+3x-3x+3x²=

=x+x²-6