As long as the equation is 9x3 + 27x2 - 90x = 0, the answer is : 27 + 27x2 - 90x = 0 9x3 = 27 27 + 54 - 90x = 0 27x2 = 54 81 - 90x = 0 27 + 54 = 81 81 = 90x add 90x to each side 9/10 = x divide each side by 90 x = .9
90x
15 = 8x2 - 14x; whence, 8x2 - 14x - 15 = (2x - 5)(4x + 3) = 0. Therefore, x = 5/2 or -3/4.
15 min.Let the time be x minutes.THEREFOREtheir combined rate = 1 pool per x minutes ortheir combined rate = 1/x pool per minute>>...Jim can fill a pool...in 30 minutes...>...Sue can do the same job in 45 minutes...>...Tony can do the same job in 1 ½ hours.,,
Special product and factoring
54 + -90x
As long as the equation is 9x3 + 27x2 - 90x = 0, the answer is : 27 + 27x2 - 90x = 0 9x3 = 27 27 + 54 - 90x = 0 27x2 = 54 81 - 90x = 0 27 + 54 = 81 81 = 90x add 90x to each side 9/10 = x divide each side by 90 x = .9
90x=1977x=1977/90x=21.966666667
9
27x2 - 90x + 27 = 9*(3x - 1)*(x - 3)
90x
135
(x+5)(x-3)
90x
factoring whole numbers,factoring out the greatest common factor,factoring trinomials,factoring the difference of two squares,factoring the sum or difference of two cubes,factoring by grouping.
9(10x + 9y)
y/90