x2 + 3x + 4
This is quadratic because the highest exponent of x is 2, and it is an expression because there is no equals sign.
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A quadratic expression is an expression which is written in the form ax2+bx+c, where a, b, and c represent constants, x represents a variable, and a is not equal to 0.
You will apply them when solving quadratic equations in which the quadratic expression cannot be factorised.
The one that forms a parabola (a hump, sort of) is called the quadratic expression or quadratic formula.
If you mean: x2+12x+35 then it is a quadratic expression that can be factored as: (x+5)(x+7)
It is a quadratic expression and is (2y-1)(3y-4) when factored