Question

(a-4)²-2a(5a-4) и найдите его значение при a = -1/3​

Answer 1

Ответ:

a^2-8a+16-10a^2+8a= -9a^2+16

-9(-1\3)^2 +16=-9*1\9+16=-1+16=15

Объяснение:

Answer 2

To find the value of the expression (a-4)² - 2a(5a-4) when a = -1/3, you can simply substitute the value of a into the expression and then perform the calculations.

Given expression: (a-4)² - 2a(5a-4)

Step 1: Substitute a with -1/3 =(-1/3 - 4)² - 2(-1/3)(5(-1/3) - 4)

Step 2: Perform the calculations

=(-13/3)² - 2(-1/3)(-17/3)

=(-13/3)² - 2(17/9)

Step 3: Square -13/3

=(-169/9) - 2(17/9)

Step 4: Distribute the -2

=(-169/9) - 34/9

Step 5: Combine like terms

=(-169/9) - (34/9)

Step 6: Subtract fractions with the same denominator

=(-169 - 34) / 9

Step 7: Final Calculation

= -203 / 9

So, when a = -1/3, the value of the expression (a-4)² - 2a(5a-4) is -203/9.