Question

5. Simplify the following expressions and evaluate them as directed:
1)x^2(3 – 2x +x^2) for x = 1; x = -1; x = and x = -1/2

2) 5xy(3x + 4y – 7) – 3y(xy – x^2 + 9) - 8 for x = 2, y = -1​

Answer 1

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Answer 2

Answer:

1)   (i) x=1

        1(3-2+2)  =  3

    (ii) x= -1

         (-1)²(3-2(-1)+(-1)²)

         1(6) = 6

     (iii) x= -1/2

          (-1/2)² (3-2(-1/2) + (-1/2)²

          1/4 (4+1/4)   =   1/4 (17/4)    =  17/16

2) (5(2)(-1)) ((3(2)+4(-1)-7)) -3(-1) ((2)(-1)-4+9) - 8

   (-10)(-5)+3(3)-8

   50+1  = 51