Question

3x 2 + 2x - 5 and -4 + 7x 2

Answer 1

`\boxed{ \bold{ \huge{ \boxed{ \sf{10 {x}^(2) + 2x - 9}}}}}`

Explanation:

`\sf{3 {x}^(2) + 2x - 5 + ( - 4 + 7 {x}^(2) )}`

When there is a ( + ) in front of an expression in parentheses, there is no need to change the sign of each term.

That means , the expression remains the same.

⇒
`\sf{3 {x}^(2) + 2x - 5 - 4 + 7 {x}^(2) }`

Collect like terms

⇒
`\sf{ {10x}^(2) + 2x - 5 - 4}`

Calculate

⇒
`\sf{10 {x}^(2) + 2x - 9}`

Hope I helped!

Best regards!!