Simplify and find '?'
48?+32? = 320
given
48?+32?= 320
=> 6?+4?=40
Now squaring on both sides
=> 36 x ? + 16 x ? + 48 x ? = 1600
=> 100 x ? = 1600
=> ? = 16
If a - b = 5 and a2 + b2 = 97, ab = ?
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