У=(х+2)²-3

To simplify the expression у=(х+2)²-3, you need to expand the squared term and simplify the result.

Step 1: Expand the squared term (х+2)²: (х+2)² = (х+2)(х+2) = х² + 2х + 2х + 4 = х² + 4х + 4

Step 2: Now substitute the expanded term back into the expression: у = х² + 4х + 4 - 3

Step 3: Simplify the expression further by combining like terms: у = х² + 4х + 1

So, у=(х+2)²-3 simplifies to у = х² + 4х + 1.