Question 978693
Hi there,
the sum of 4x^2+3x-1 and 6x-5
= 4x^2 + 9x - 6
subtract 3x^2-4x+2 
(4x^2 + 9x - 6)- (3x^2-4x+2)
4x^2 + 9x - 6 - 3x^2 + 4x - 2
= x^2 + 13x - 8
Hope this helps:-)