Now we stipulate an operation: a * b = AB + a-b. where a and B are rational numbers, then the value of 3 * 5 is? Elder brothers and sisters, I ask for process and reason, otherwise I will never be like this

Now we stipulate an operation: a * b = AB + a-b. where a and B are rational numbers, then the value of 3 * 5 is? Elder brothers and sisters, I ask for process and reason, otherwise I will never be like this


Very simple, just change the letters in the same position into numbers
Replace a with 3, B with 5
3*5=3*5+3-5=13



Given (a + b) ^ 2 = 13, (a-b) ^ 2 = 11, find the value of ab





What is the square of X + the square of X


x²+x²
=2x²

Elden Ring Premiere

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