Respuesta :
[tex]7x^2+10x^2=17x^2\\\\if\ not\ sume\ only\ difference\\\\7x^2-10x^2=-3x^2[/tex]
Answer: The required answer is 3x².
Step-by-step explanation: We are given that the sum of an expression E and 7x² is 10x².
We are to find the value of the expression E.
According to the given information, we have
[tex]E+7x^2=10x^2\\\\\Rightarrow E=10x^2-7x^2\\\\\Rightarrow E=(10-7)x^2\\\\\Rightarrow E=3x^2.[/tex]
Thus, the required answer is 3x².