Question

What are the solutions of the equation x4 – 5x2 – 36 = 0? Use factoring to solve.

Answer 1

x=+/-3

Explanation:

x^4-5x^2-36=0

factor

(x^2-9)(x^2+4)=0

split into 2 equations because one of these terms will need to equal zero for the eqation to be true

x^2-9=0 x^2+4=0

x^2=9 x^2=-4

x=+/-3 no real numbers

Answer 2

B) X = ±2i and x = ±3

Explanation:

Took the test