. If x = 1 and y = -1 then find the value of the product of 2x and (7x - 3y).
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2x × (7x-3y)
= (2x×7x) - (2x×3y)
= 14x²-6xy
=14×1² - {6×(1×-1)} {when x = 1, y = -1}
= 14×1 - {6×{-1})
= 14 - (-6)
= 14 + 6
= 20
Hence, he value of the product of 2x and (7x - 3y) is 20.
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