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.