(2x 2 −3x+1)+(7x 2 +10x+8)

The given expression is: (2x^2 -3x+1)+(7x^2 +10x+8)

Step 1: Remove the brackets. Since there is no negative sign in front of either bracket, the expression remains the same after removing the brackets.

So, the expression becomes: 2x^2 -3x+1+7x^2 +10x+8

Step 2: Group like terms together. This means grouping terms with x^2 together, terms with x together, and constant terms together.

So, the expression becomes: (2x^2 + 7x^2) + (-3x + 10x) + (1 + 8)

Step 3: Simplify each group of like terms.

So, the expression becomes: 9x^2 + 7x + 9

So, (2x^2 -3x+1)+(7x^2 +10x+8) simplifies to 9x^2 + 7x + 9.