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Q: What is x when x squared plus x - 20 equals 0?

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If you mean: x2+9x+20 then it is (x+4)(x+5) = 0 when factored

It is: 3x2+6x-11 = 0

It can not be factored because its discriminant is less than zero

x2 + 9x + 20 = 0 ∴(x + 4)(x + 5) = 0 ∴x ∈ {-5, -4}

The solutions are: x = 4, y = 2 and x = -4, y = -2

63828

True because in both equations x = 0 or x = -4

It is a quadratic equation.

x2-35x+300 = 0 (x-15)(x-20) = 0 x = 15 or x = 20

4

x = -½

x2 + 6x + 8 = 0 Solve for x.X = -2 or X = -4

Using the discriminant of b^2 -4ac = 0 the value of k works out as -2

It is a quadratic equation in the variable x.

y equals x plus 4 when y equals 0 then x equals 2i i is the square root of negative 1

(x + 3)(x + 2)

3x(2x + 1)

(2x-4)(x-1) = 0

(x-3)(x-5) = 0

(x-3)(x-9) = 0

No, It's a a quadratic equation because you have X squared.

x2 = x+20 x2-x-20 = 0 (x-5)(x+4) = 0 x = 5 or x = -4

4(w^2 + 3w + 1)

7

X=1/2