80 x 0 = 0
Think about it!!! If you have NOTHING (0), how can you multiply it to anything. !!!!
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80 = (8 x 10) + (0 x 1)
x2=18x-80 (im guessing you are trying to find x) x2-18x+80=0 (x-10)(x-8)=0 Therefore: x = 10, 8
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If: y = 20 -x and x^2 +y^2 = 80 Then: x^2 +(20-x)^2 = 80 Multiplying out the brackets: x^2 +400 -80x +4x^2 = 80 Transposing terms: 5x^2 +320 -80x = 0 Divide all terms by five: x^2 +64 -16x = 0 Factorizing: (x-8)(x-8) = 0 => x = 8 and x = 8 By substitution point of contact is at: (8, 4)
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