The expression x squared plus x can be simplified as x^2 + x. This is a quadratic expression with a leading coefficient of 1. It represents a polynomial with two terms, a quadratic term (x^2) and a linear term (x).
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X = √63
Assuming you mean x squared plus 5x squared... the answer is 6x squared.
X + y
x squared +6x +5 is a quadratic expression that can be factored as (x+1)(x+5)
x^2+2x^2=3x^2