Best Answer

x3 + 7x = 8x2

x3 + 7x - 8x2 = 0 [subtract 8x2 from both sides]

x(x2 + 7 - 8x) = 0 [factor out x]

x(x-1)(x-7) = 0 [factor]

Since the product of the three factors x, x-1, and x-7 equals zero, any of the three expressions could equal zero:

x = 0

x - 1 = 0, x = 1

x - 7 = 0, x = 7

Therefore, there are three solutions to the equation x3 + 7x = 8x2:

- x = 0
- x = 1
- x = 7

Or, in set notation: x = {0,1,7}

Q: Solve x3 plus 7x equals 8x2?

Write your answer...

Submit

Still have questions?

Continue Learning about Math & Arithmetic

7x + 2 = 5,6

Subtract by 7x and divide by 2.

7x = 3x - 12 4x=-12 x=-3

7x+2-2=16-27x = 147x/7 = 14/7x = 2

sin7x-sin6x+sin5x

Related questions

7x + y = 4y = 4 - 7x

7x + 2 = 5,6

Subtract by 7x and divide by 2.

7x + y = 8 Subtract 7x from each side of the equation: y = -7x + 8

24

There is no symbol between 7x and 31. Please resubmit using words eg "plus", "equals" etc.

7x = 3x - 12 4x=-12 x=-3

(3,3)

7x+2-2=16-27x = 147x/7 = 14/7x = 2

4x+9 = 7x+3 4x-7x = 3-9 -3x = -6 x = 2

7x + 8 = 11x + 3, solve for xsubtract 7x from both sides8 = 11x - 7x + 38 = 5x + 3subtract 3 from both sides5 = 5xdivide both sides by 51 = x.

2(4x^2 - 7x + 5)