You can solve this as a quadratic (it's degree is 2).
9x^2+2x=7
9x^2+2x-7=0 (Hey, a quadratic!)
(9x-7)(x+1)=0
Thus, the solutions for x to this problem are -1, and 7/9.
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Yes it is. The thing that makes it a quadratic equation is that "x squared" in there.
2x2 + 2x - 8 = 2(x2 + x - 4). This can take any value greater than or equal to -8.5
It is a quadratic equation.
x2 + x2 = 2x2 2x^2