Question

simplify the following expressions and evaluate them as directed:. 5xy(3x+4y-7)3y(xy-x²+9)-8 for x=2, y =-1​

Answer 1

Answer:

The answer is 51.

Step-by-step explanation:

5xy(3x+4y-7)-3y(xy-x2+9)-8=15xxy+20xyy-35xy-3xyy+3xxy-27y-8.

Simplifying: 18xxy+17xyy-35xy-27y-8

Put x=2 & y= -1 , 18(4)(-1)+17(2)(-1*-1)-35(2)(-1)-27(-1)-8

= -72+34+70+27-8

Ans.= 51.

Answer 2

Answer:

  5xy(3x+4y-7)3y(xy-x²+9)-8

=>5*2*-1 (3 * 2 + 4 *-1 -7) 3*-1(2*-1 - 2^2 + 9) -8

=> -10 ( 6 - 4 -7) -3 (-2-4+9) - 8

=> -10 ( -5) -3 (3) -8

=> 50 - 9 - 8

=> 33

Here Goes Your Answer...

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