2007-09-09 08:09:35 · 5 answers · asked by JFK fan--(Hug Brigade) 4 in Science & Mathematics ➔ Mathematics
2x^2-7x-30
a) The best way is to find two numbers that a product equal to ac and a sum equal to b.
ac=-60 , b= -7; the two numbers are -12*5=-60, and -12+5=-7
b) Now replace bx by two terms using the two new numbers as coefficients.
2x^2-12x+5x-30
c) Factor the resulting four term polynomial by grouping. Factor the first two together, and the last two together.
2x(x-6) +5(x-6)
d) The answer is (2x+5) (x-6)
2007-09-09 09:09:51 · answer #1 · answered by Anonymous · 0⤊ 0⤋
(2x+5)(x-6)
Note the 5 & 6 are actors of 30 (5*6=30)
and -12 + 5= -7
2007-09-09 15:15:16 · answer #2 · answered by 037 G 6 · 1⤊ 0⤋
2x^2 - 7x - 30 = 0
(2x + 5)(x - 6)
2007-09-09 15:17:31 · answer #3 · answered by Anonymous · 0⤊ 0⤋
(x-6)(2x+5)
2007-09-09 15:14:21 · answer #4 · answered by dell_dude360 2 · 0⤊ 1⤋
-2.5,6
2007-09-09 15:18:05 · answer #5 · answered by rajann_786 2 · 0⤊ 0⤋