Question

(a+5)(+a²-5a+25)-125,если a=-3​

Answer 1

(а+5)(а²-5а+25)-125 = а³-5а²+25а+5а²-25а+125-125 = а³ при а=-3.

Если а=-3, то а³ = (-3)³ =-27.

Ответ: -27.

Answer 2

To evaluate the expression, let's substitute the value of a into the given expression:

(a + 5)(a² - 5a + 25) - 125, with a = -3

Substituting a = -3, we have:

((-3) + 5)((-3)² - 5(-3) + 25) - 125

Simplifying the expression inside the first set of parentheses:

(2)((9) + 15 + 25) - 125

Simplifying the expression inside the second set of parentheses:

(2)(9 + 15 + 25) - 125

Performing the addition inside the parentheses:

(2)(49) - 125

Multiplying 2 by 49:

98 - 125

Subtracting 125 from 98:

-27

Therefore, when a = -3, the expression (a + 5)(a² - 5a + 25) - 125 equals -27.