Question

Subtract the first expression from the second expression:- 19x2-19y2 from 19y2-19x2

Answer 1

$19y^2 - 19x^2 - ( 19x^2 - 19y^2 )\\= 19y^2 - 19x^2 - 19x^2 + 19y^2\\= ( 19 + 19 )y^2 + ( - 19 - 19 )x^2= 38y^2 + ( - 38 )x^2\\= 38y^2 - 38x^2$