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16r^{2}+40r+25
Utilitzeu el teorema del binomi \left(a+b\right)^{2}=a^{2}+2ab+b^{2} per desenvolupar \left(4r+5\right)^{2}.
16r^{2}+40r+25
Utilitzeu el teorema del binomi \left(a+b\right)^{2}=a^{2}+2ab+b^{2} per desenvolupar \left(4r+5\right)^{2}.