2(x - 2)(x + 4) = 0
x = 2, -4
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x = -½
2x2= 4
16
2y = 4x - 16 5y = 4x + 8 Subtract the first equation from the second: 3y = 24 so that y = 8 Substitute this into the first equation: 16 = 4x - 16 ie 32 = 4x so that x = 8 So the solution is (8, 8)
The derivative of 2x2 + 4x + 8 is 4x+4.