08-05-2014
Mathematics

Answered

If P = a^2 + a - 1 and R = –a - 1, which expression represents P + R
a) a^2 + 2
b) a^2 - 2
c) a^2 + 2a
d) a^2 + 2a - 2

Answer :

Аноним Аноним

08-05-2014

[tex]P=a^2+a-1;\ R=-a-1\\\\P+R=(a^2+a-1)+(-a-1)=a^2+a-1-a-1=a^2-2\\\\Answer:b)[/tex]

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