Given a + B = 1, ab = - 1, according to (a ^ 2 + B ^ 2) (a + b) = a ^ 3 + B ^ 3 + A ^ 2B + AB ^ 2, calculate the value of a ^ 3 + B ^ 3

Given a + B = 1, ab = - 1, according to (a ^ 2 + B ^ 2) (a + b) = a ^ 3 + B ^ 3 + A ^ 2B + AB ^ 2, calculate the value of a ^ 3 + B ^ 3

If AB is opposite to each other, what is a + B equal to?

If AB is opposite to each other, then a + B is equal to 0

If a and B are opposite to each other, what is a + B equal to? What is a of B equal to? What are the exceptions? If AB = 0, then a and B must be opposite to each other? Why?

If a and B are opposite to each other, then a + B is equal to 0, and a of B is equal to - 1. In this case, if AB = 0, the two numbers cannot be 0
If AB = 0, then a and B are not necessarily opposite numbers, because 0 multiplied by any number will get 0

How about X-2 / 7X = 1 / 14

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x-2/7x=15

x-2/7x=15
5／7x=15
x=21

X-2 / 7X = 14

7x/(x-2)=14
To denominator: 7x = 14 * (X-2)
7x=14x-28
-7x=-28
x=4
Test: x = 4 is the solution of the original equation

The solution of 8x: (7x + 15) = 7 ∶ 8

8×8x=7(7x+15)
64x=49x+105
64x-49x=105
15x=105
x=7

How to solve 2.7x-3 = 7.8

2.7x-3=7.8
2.7x=3+7.8
2.7x=10.8
x=4

8 times 2 and 3 / 4-7x = 7

8 times 2 and 3 / 4-7x = 7
22-7 = 7x of 15
x=225/7
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Calculation (7 + x) (49-7x + x ^ 2)

（7+X）（49-7X+X^2）
=（7+x）（7-x）²
=（49-x²）（7-x）
=343-7x²-49x+x³