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It is a quadratic equation and the values of x are -1/2 or -2/3

Do you mean 12x2+14x+4 = 0

If so then x = -2/3 and x = -1/2

Q: What is 12x2 plus 14x plus 4 equals 0?

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That is a quadratic equation. You can solve it easily if you factor it to 2(2x - 1)(3x - 2) and find what makes each factor 0. The solutions are 1/2 and 2/3; you can see the steps taken to get here using the link under "related links".

x2 + 14x + 45 = 0 => x2 + 9x + 5x + 45 = 0 => x(x + 9) + 5(x + 9) = 0 (x + 9)(x + 5) = 0 so that x = -5 or x = -9

x^2 + 14x + 40 factorises as (x + 10)(x + 4) so the roots are x = -10, -4.

x2 - 14x = -49 ∴ x2 - 14x + 49 = 0 ∴ (x - 7)2 = 0 ∴ x = 7

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3x2+14x+8 = 0 x = -2/3 or x = -4

x2+12x+36=0 2x+12x+36=0 14x+36=0 14x=-36 x=-36/14 x=-2 4/7

That is a quadratic equation. You can solve it easily if you factor it to 2(2x - 1)(3x - 2) and find what makes each factor 0. The solutions are 1/2 and 2/3; you can see the steps taken to get here using the link under "related links".

The roots are: x = -5 and x = -9

x2 + 14x + 45 = 0 => x2 + 9x + 5x + 45 = 0 => x(x + 9) + 5(x + 9) = 0 (x + 9)(x + 5) = 0 so that x = -5 or x = -9

y=-2/3x with any y-intercept except -2.

x^2 + 14x + 40 factorises as (x + 10)(x + 4) so the roots are x = -10, -4.

x2-14x+45=0(x-9)(x-5)=0x-9=0 & x-5=0x=9 & x=5

x2 - 14x = -49 ∴ x2 - 14x + 49 = 0 ∴ (x - 7)2 = 0 ∴ x = 7

12x2 + 8x = 0 4x(3x + 2) = 0 Two solutions: 1. x = 0 2. x = -2/3

x = 1.5 because -7x + 3 = -15/2 -14x + 6 = -15 (x2) -14x + 21 = 0 (+15) 21 = 14x (+14x) 3 = 2x (/7) 1.5 = x

The answer is [ x = 1/7 ].