Factor 6x4 - 5x2 + 12x2 - 10 by grouping. What is the resulting expression?

(6x + 5) (x2 - 2)

(6x - 5) (x2 + 2)

(6x2 + 5) (x2 - 2)

(6x2 - 5) (x2 + 2)

The expression is giving as:

6x^4 - 5x^2 + 12x^2 - 10 = 0

We group the first two terms and the last two terms.

(6x^4 - 5x^2) + (12x^2 - 10) = 0

For the first group we factor out x^2 and in the second term we factor out 2.

x^2 (6x^2 - 5) + 2 (6x^2 - 5) = 0

We factor out 6x^2 - 5.

(6x^2 - 5) (x^2 + 2) = 0

Therefore the correct answer is the last option.