Find the product of (7x−4y) and (3x−7y). A. 21 x 2 + 28 y 2 + 61 x y B. 21 x 2 − 28 y 2 − 61 x y C. 21 x 2 + 28 y 2 − 61 x y D. 21 x 2 + 28 y 2 − 37 x y

Question

Find the product of (7x−4y) and (3x−7y). A.   21      x    2    +  28      y    2    +  61  x  y B.   21      x    2    −  28      y    2    −  61  x  y C.   21      x    2    +  28      y    2    −  61  x  y D.   21      x    2    +  28      y    2    −  37  x  y

Desiree Cantrell · Accepted Answer

(  7  x  −  4  y  )  (  3  x  −  7  y  )=  (  7  x  ×  3  x  )  +  (  7  x  ×  (  −  7  y  )  )  +  (  (  −  4  y  )  ×  (  3  x  )  )  +  (  (  −  4  y  )  ×  (  −  7  y  )  ) (Using distributive property)  =  21      x    2    −  49  x  y  −  12  x  y  +  28      y    2     =  21      x    2    +  28      y    2    −  61  x  y

Find the product of (7x−4y) and (3x−7y). A. 21x^2 + 28y^2 + 61xy B. 21x^2 - 28y^2 - 61xy C. 21x^2 + 28y^2 - 61xy D. 21x^2 + 28y^2 - 37xy

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