Expand (3p+4q+5r)²
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Answer:
(a+b+c)²
a²+b²+c²+2ab+2bc+2ac
3p²+4q²+5r²+2*3p*4q+2*4q*5r+2*3p*5r
9p²+16q²+25r²+24pq+40qr+30pr
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