Add
(7x^2-2x)+(4x-3)

a. 7x^2-6x+3
b. 28x^3-29x^2+6x
c. 7x^2+2x-3
d. 11x^2-5x

All you have to do is combine like terms/variables.

C) 7x^2 + 2x - 2 would be the correct answer.

Since 7x^2 is the only variable with an exponent, it stays the same. Now you add -2x and +4x since four is positive and larger than 2, that means the answer will be positive. That would make it 2x and -3 is the only number which remains the same.