Question

17a-2(3a-4)^2-65a при a=✓15

Answer 1

17а - 2(3а - 4)² - 65а = 
= 17а - 2(9а² - 24а +16) - 65а = 
= 17а - 18а² + 48а - 32 - 65а = 
= -18а² - 32,

при а = √15:   -18*(√15)² - 32 = -18*15 - 32 = -270 - 32 = -302

Answer 2

-48a-2(3a-4)^2=-48a-2(9a^2-24a+16)=-48a-18a^2+48a-32=-18a^2-32=-18*15-32=-302

Ответ -302

Answer 3

To calculate the expression 17a - 2(3a - 4)^2 - 65a when a = √15, follow these steps:

Step 1: Replace 'a' with √15 in the expression. Step 2: Simplify the expression.

Step 1: Replace 'a' with √15: 17(√15) - 2(3(√15) - 4)^2 - 65(√15)

Step 2: Now, let's simplify each part of the expression: 17(√15) = 17√15 3(√15) = 3√15 (3(√15) - 4) = 3√15 - 4 (3√15 - 4)^2 = (3√15 - 4)(3√15 - 4) = 9(15) - 24√15 + 16 = 121 - 24√15 2(3√15 - 4)^2 = 2(121 - 24√15) = 242 - 48√15 65(√15) = 65√15

Now, let's put it all together: 17√15 - 2(3√15 - 4)^2 - 65√15 = 17√15 - (242 - 48√15) - 65√15 = 17√15 - 242 + 48√15 - 65√15 = (17√15 - 65√15) + 48√15 - 242 = -48√15 - 194 = -48√15 - 194 (approximately -222.13)

So, when a = √15, the expression evaluates to approximately -222.13.