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Answer 1 · 2018-01-07T22:22:25

#12x^2-7x-12#

Expand the brackets by simply multiplying each term by the other term in the other brackets.

#therefore#

#3x * 4x = 12x^2#

#3x *3 = 9x#

#-4 * 4x = -16x#

#-4 * 3 = -12#

Putting this together gives # 12x^2+9x-16x-12# which simplifies to #12x^2-7x-12#.