Question

Find the product (3x -2y) (4x+5y) and also evaluate it for x=1, y= -1

Answer 1

$(3x - 2y)(4x + 5y) \\ = 12x ^{2} + 15xy + - 8xy - 10y ^{2} \\ = 12x ^{2} + 7xy - 10y ^{2}$
After putting value of x and y in the above product
We will get
(3x-2y) (4x+5y) = (- 5).


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