Question

X*3+3x*2-45x-1 при x= -8 x= 8 x= -5 x= 3

Answer 1

Ответ:

1)x= -8 то -24-48+360-1=287

2)х= 8 то 24+48-360-1= -289

3)х= -5 то -15-30+225-1=179

4)x= 3 то 9+18-135-1= -109

Answer 2

To evaluate the expression $x \cdot 3 + 3x^2 - 45x - 1$ for different values of $x$, simply substitute the given values and perform the calculations.

1. For $x = -8$: $x \cdot 3 + 3x^2 - 45x - 1 = (-8) \cdot 3 + 3 \cdot (-8)^2 - 45 \cdot (-8) - 1$ $= -24 + 192 + 360 - 1$ $= 527$

2. For $x = 8$: $x \cdot 3 + 3x^2 - 45x - 1 = 8 \cdot 3 + 3 \cdot 8^2 - 45 \cdot 8 - 1$ $= 24 + 192 - 360 - 1$ $= -145$

3. For $x = -5$: $x \cdot 3 + 3x^2 - 45x - 1 = (-5) \cdot 3 + 3 \cdot (-5)^2 - 45 \cdot (-5) - 1$ $= -15 + 75 + 225 - 1$ $= 284$

4. For $x = 3$: $x \cdot 3 + 3x^2 - 45x - 1 = 3 \cdot 3 + 3 \cdot 3^2 - 45 \cdot 3 - 1$ $= 9 + 27 - 135 - 1$ $= -100$

So, the values of the expression for the given $x$ values are: $x = -8$ : 527 $x = 8$ : -145 $x = -5$ : 284 $x = 3$ : -100