Question

1)-4а-3в+7 при а=5 в=-4. 2) х (в кубе 2) -3х+4 при х=15 помогите пожалуйста)))(((

Answer 1

1)-4*5-3*(-4)+7=20+12+7=39
2)x³
3)-3*15+4=-45+4=-41

Answer 2

1. To evaluate the expression -4а - 3в + 7 when а = 5 and в = -4, substitute the given values into the expression:

-4(5) - 3(-4) + 7

Now, perform the calculations step by step:

= -20 + 12 + 7 = -8 + 7 = -1

So, the value of the expression when а = 5 and в = -4 is -1.

2. To evaluate the expression х^3 - 3х + 4 when х = 15, substitute the given value into the expression:

15^3 - 3 * 15 + 4

Now, perform the calculations step by step:

= 3375 - 45 + 4 = 3330 + 4 = 3334

So, the value of the expression when х = 15 is 3334.