I have to factor these polynomials
64x^3+343
400x^2-25
x^4+8x^2-9
2x^3-3x^2+4x-6
first one use the sum of two cubes formula.
it will be helpful to write as
for the second one, use the difference of two squares formula
it may be helpful to write as
the third one, first factor by inspection.
then use the difference of two squares formula on the first factor
For the last one, are you familiar with synthetic division ? if i told you (2x-3) was a factor could you factor it ?