Q: Is y equals 3x plus 1 and -2x2 a function?

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2x2 + 3x - 20 = (x + 4)(2x - 5).

The discriminant is 1.

d/dx 2x2+3x+7=4x+3

y=3x+12

If 2x2 + 3x + 9 = 0 then x = -0.75 - 1.984i or -0.75 + 1.984i where i is the imaginary square root of -1.

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2x2 equals 5

B- It is a many-to-one function

2x2 + 3x - 20 = (x + 4)(2x - 5).

If: 2x2-3x+1 = 0 Then: x = 1 or x = 1/2

The discriminant is 1.

2x2 + 3x + 1 = (x + 1)(2x + 1)

d/dx 2x2+3x+7=4x+3

(2x - 1)(x - 1) so x = ½ or 1

factorises as (2x + 1)(x + 1) so x = -0.5 or -1

yes

-11

x2+7x=-2x2+6 3x2+7x-6=0 (3x-2)(x+3)=0 3x-2=0 or x+3=0 x=2/3 or x=-3