Question

solve by any method x^3-15x=0

Answer 1

ok let's do it together first switch -15x to the right and see what happens

Answer 2

x^3=15x

Answer 3

now cancel the x's what do you get

Answer 4

the third power equals 15

Answer 5

no! x^3 means x^2*x so you have
x^2*x=15x now you remove the x from both sides so what is left?

Answer 6

x^2=15

Answer 7

YES! so the answer to the equation is?

Answer 8

x=the square root of 15

Answer 9

Solve by any method x^2-x-7=0

Answer 10

use the quadratic formula -b+/-sqrt b^2-4ac