Question

x^4 - 7x^2 -18 = 0 Solve

Answer 1

x4−7x2−18=0
Step 1: Factor left side of equation.
(x2+2)(x+3)(x−3)=0
Step 2: Set factors equal to 0.
x2+2=0 or x+3=0 or x−3=0
x=−3 or x=3