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Q: What is x squared plus 10x-11 equals 0?

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

63828

It is a quadratic equation.

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

4

x = -½

It is a quadratic equation in the variable x.

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

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

4, -5

3x(2x + 1)

(x + 3)(x + 2)

(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.

144 + 0

0 squared is 0. Zero times zero equals zero.

4(w^2 + 3w + 1)

7

X=1/2

144

3x2 + 2x - 8 = 0 is a quadratic equation.

The centre is (a, a) and the radius is a*sqrt(2).

They touch each other at (0, 100) on the x and y axis.