2007-02-02 14:09:13 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
First: multiply the 1st & 3rd coefficient to get "-300." Find two numbers that give you "-300" when multiplied & "-5" (2nd/middle coefficient) when added/subtracted. The numbers are (15 & 20).
Sec: rewrite the expression with the new middle coefficients...
12x^2 + 15x - 20x - 25
Third: when you have 4 terms - group "like" terms & factor...
(12x^2 + 15x) - (20x - 25)
3x(4x + 5) - 5(4x + 5)
= (4x + 5)(3x - 5)
2007-02-02 14:15:29 · answer #1 · answered by ♪♥Annie♥♪ 6 · 1⤊ 0⤋
You mean the factors?
The factors of 12x^2-5x-25 are 4x+5 and 3x-5
2007-02-02 14:17:59 · answer #2 · answered by dennismeng90 6 · 0⤊ 0⤋
12x^2-20x+15x-25
=4x(3x-5)+5(3x-5)
=(3x+5)(4x+5)-----------This is the answer
2007-02-02 14:13:46 · answer #3 · answered by Anonymous · 0⤊ 1⤋
(4x+5) (3x-5)
2007-02-02 14:14:14 · answer #4 · answered by Anonymous · 0⤊ 1⤋
(4X + 5) (3X - 5)
2007-02-02 14:15:45 · answer #5 · answered by davidosterberg1 6 · 0⤊ 0⤋