Question

(x-2)(x-5)-(x+3)(x-4) если х=-4,5 (a-6)(a+1)+(2-a)(3+4a) если х=-1 1/3

Answer 1

(х-2)(х-5)-(х+3)(х-4) если х=-4,5

(х^2-5х-2х+10)-(х^2-4х+3х-12)=

х^2-5х-2х+10-х^2 +4х-3х+12=

-6х+22= -6*(-4,5)+22=27+22=49

(а-6)(а+1)+(2-а)(3+4а) если а=-1 1/3

а^2+а-6а-6+6+8а-3а-4а^2=

-3а^2=-3*(-1 1/3)^2=-1 8/9

Answer 2

To evaluate the expressions given, let's substitute the given values of x and a into the expressions and simplify:

Expression 1: (x - 2)(x - 5) - (x + 3)(x - 4)

For x = -4.5: ((-4.5) - 2)((-4.5) - 5) - ((-4.5) + 3)((-4.5) - 4) (-6.5)(-9.5) - (-1.5)(-8.5) 61.75 - 12.75 Result: 49

Expression 2: (a - 6)(a + 1) + (2 - a)(3 + 4a)

For a = -1/3: ((-1/3) - 6)((-1/3) + 1) + (2 - (-1/3))(3 + 4(-1/3)) (-19/3)(2/3) + (7/3)(8/3) -38/9 + 56/9 Result: 18/9 or 2/1 or 2