How can I show that -LSB- math -RSB- -LRB- x + t -RRB- ^ 2 = x ^ 2 +2 · t · x + t ^ 2 -LSB- / math -RSB- ?
How can I show that -LSB- math -RSB- -LRB- x ^ 2-y ^ 2 -RRB- -LRB- a ^ 2-b ^ 2 -RRB- = t ^ 2-z ^ 2 -LSB- / math -RSB- ?