Question

If a+b=5, a-b=7 then find value of a²-b²​

Answer 1

Answer: 39

Step-by-step explanation:

By taking the formula (a+b)square = a square + b square +2ab

By substituting the values :

                                   (7)square     = a square + b square + 2*5

                                                   49 = a square + b square + 10

                                              49-10 = a square + b square

                                                   39 = a square + b square.

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Answer 2

Answer:

we know that (a+b)(a-b)=a²-b²

there for

a²-b²=5.7=35

your answer is 35