The first and third are quadratic expressions in x, the second is a quadratic expressions in n, and the fourth is a quadratic expressions in y. None of them are equations so cannot be solved.
2. 2 plus 2 equals 4 and 2(2)= 4
Polynomials with two terms are called "binomials." A binomial consists of two monomial terms separated by either a plus or minus sign. For example, expressions like (3x + 5) or (2y^2 - 4) are both binomials.
5b + 5b = 2 x 5b
These are two expressions, not equations. Expressions do not have solutions, only equations do. NB equations include the equals sign.
Such expressions illustrate the distributive property of multiplication over addition in the field of real numbers.
The first and third are quadratic expressions in x, the second is a quadratic expressions in n, and the fourth is a quadratic expressions in y. None of them are equations so cannot be solved.
Two linear expressions with a sum of -5x plus 4 are ( -5x + 4 ) and ( 4 - 5x).
2. 2 plus 2 equals 4 and 2(2)= 4
Polynomials with two terms are called "binomials." A binomial consists of two monomial terms separated by either a plus or minus sign. For example, expressions like (3x + 5) or (2y^2 - 4) are both binomials.
5b + 5b = 2 x 5b
These are two expressions, not equations. Expressions do not have solutions, only equations do. NB equations include the equals sign.
2 plus n is the true one, but 1 plus n is not?
Equivalent expressions
(16 + 4x)/2 2(4 + x)
yes
They have n in common.