Rewrite the following expression as an addition and as a multiplication:
(3x−y)2
To solve this problem, let's start by identifying the parts of the binomial:
- The expression (3x−y)2 represents a binomial squared.
- We recognize it has the form (a−b)2 where a=3x and b=y.
- Using the formula for the square of a difference: (a−b)2=a2−2ab+b2, we find the expanded form.
Let's apply the formula:
Step 1: Expand (3x−y)2 using the formula:
(3x−y)2=(3x)2−2(3x)(y)+y2
Step 2: Calculate each part:
(3x)2=9x2
−2(3x)(y)=−6xy
y2 stays as y2
Step 3: Combine these results to get the addition form:
9x2−6xy+y2
The expression in multiplication form, as provided, is just repeating the factors:
(3x−y)(3x−y)
Therefore, the expression rewritten as addition is 9x2−6xy+y2 and as multiplication (3x−y)(3x−y).
9x2−6xy+y2
(3x−y)(3x−y)