Question

2 x square - 3 x square -15

Answer 1

2^2-3^2-15
4-9-15
-9-11
-20

Answer 2

${2}^{2} \: - { 3}^{2} - 15 = 0$
4 - 9 - 15 =0
-5 - 15 =0
-20