Question

Factor 12x² + 19x - 21.O (6x + 7)(2x − 3)—O (4x - 3)(3x + 7)O(6x-7)(2x + 3)(4x + 3)(3x7)

Answer 1

given the expression

`12x^2+19x-21`

we are loking 2 numbers whose multiplication is equal to 12

and other 2 number whose multiplication is equal to 21

the sum of the cross multiplication is equal of 19, as follows

`(4x*3x)+((4x*7)+(3x*-3))+(-3*7)`

factor is

`\left(4x-3\right)\left(3x+7\right)`

correct answer option B