2007-10-07 09:00:27 · 3 answers · asked by futrmd17 1 in Science & Mathematics ➔ Mathematics
9x^2 + 10x + 2
(3x+1)(3x+2)
Cross-products add to 10.
2007-10-07 09:06:32 · answer #1 · answered by Robert S 7 · 0⤊ 1⤋
1. distribute 9 (from the 9x^2) into the 2
x^2 + 10x + 18
2. find 2 numbers that multiply to give +18 and add to give +10
as you can probably see there ARE NOT two numbers that follow this criteria so I don't think this can be factored.
if it's for a quadratic equation though you can put it into standard form and graph or complete the square and find the x-intercepts
2007-10-07 16:47:50 · answer #2 · answered by Anonymous · 0⤊ 0⤋
well lets do the determinant to decide whether if at all if it factors.
if the determinant (b squared -4ac) = a square # then it will factor,
for this question a=9 b=10 c=2
10^2- 4*9*2=100- 72 = 28 which is not a square number and therefore this cannot be factored but you can use completign the square or the quadratic formula to solve it if you wish
p.s robert is wrong with his answer as his cross products do not add up to 10.
2007-10-07 16:08:15 · answer #3 · answered by a c 7 · 0⤊ 0⤋