Respuesta :

B. Factor out x^2 first. 12*x^4-42*x^3-90*x^2=(x^2)*(12*x^2-42*x-90). See that 6 is a common divisor of 12, 42, 90, so factor out 6: (6x^2)*(2*x^2-7*x-15).Then factor (2x^2-7x-15) as (2x+3)*(x-5). So the original expression=(6x^2)(2x+3)*(x-5)
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Answer:

B. 6x2(x – 5)(2x + 3)

Step-by-step explanation:

I got it right on Edge