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.
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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.
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