jika P=a²-5ab,Q=7ab - 4b²,dan R=4a²+3ab-7b²,maka hitunglah P+2Q-R!
Matematika
nisa2030
Pertanyaan
jika P=a²-5ab,Q=7ab - 4b²,dan R=4a²+3ab-7b²,maka hitunglah P+2Q-R!
1 Jawaban
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1. Jawaban daimatun99
P=a²-5ab
Q=7ab-4b²
R=4a²+3ab-7b²
P+2Q-R
=(a²-5ab)+2(7ab-4b²)-(4a²+3ab-7b²)
=a²-5ab+14ab-8b²-4a²+3ab-7b²
=-3a²+12ab-5b²