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If: y = 10x -12 and y = x^2 +20x +12

Then: x^2 +20x +12 = 10x -12

Transposing terms: x^2 +10x +24 = 0

Factorizing: (x+6)(x+4) = 0 => x = -6 or x = -4

Points of intersection by substitution are at: (-6, -72) and (-4, -52)

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โˆ™ 2016-10-22 11:41:18
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Q: What are the points of intersection when the line y equals 10x -12 crosses the curve y equals x squared plus 20x plus 12?
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