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Dear Student10a^2-15b^2+20c^210a^2= 2×5×a×a- 15b^2= -1×3×5×b×b20c^2= 2×2×5×c×cCommon factor of 10a^2, 15b^2and 20c^2is 510a^2-15b^2+20c^2= 5(2a^2-3b^2+4c^2)Thanks
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