Question

I Don't Know This Solve Plz​

Answer 1

Answer:

17²+ 15² +13² -2×17×15 -2×17×13 -2×15×13

289 + 225 + 169 -510 -442 -390

683 -510-442-390

173-442-390

-269 -390

-659

Step-by-step explanation:

the correct calculation is this ., I think there is a typing error in the signs