Verified answer

(5a^2 − 3a − 5) − (-5a^2 + 3a + 5)............

5a^2 − 3a − 5 + 5a^2 - 3a - 5..................

(5a^2 + 5a^2) - (3a + 3a ) - ( 5 + 5 )............

10a^2 - 6a - 10...................

2 ( 5a^2 - 3a - 5 ) ........ answer

to subtract a polynomial, you change all of irs signs and add

so(5a² − 3a − 5) − (-5a² + 3a + 5) becomes 5a² − 3a − 5 + 5a² - 3a - 5

which is 10a² - 6a -10