Question

10 x square subtracted from minus 7 x square

Answer 1

7x2-10x2 =-3x2
here 2 means square

Answer 2

$- 7 {x}^{2} - ( 10 {x) }^{2} \\ - 7 {x - 10 {x}^{2} } \\ - 17 {x}^{2}$