By factorisation:
x2 + 6xy - 27y2 = (x + 9y)(x - 3y).
3x2+6xy+3y2= 3(x2+2xy+y2)= 3(x+y)2
X2+Y3+15 All you can do is simplify it.
x(x + 2)
Factor it out: (x+2) squared
i got 42 divided 7x
5x33y4(6xy)-1First, the (6xy) can be moved to the bottom, and the 1 becomes positive. (And since anything to the first power is itself, the 1 goes away):5x33y4/(6xy)x3/x is x2 and y4/y is y3 and (5x3)/6 is 5/2, so this can be simplified to:(5/2)x2y3
i thinking this answer should be -20
x2 + 4x = x(x+4)
It is: 4x -34x^2 -21 simplified
(x2 - x - 20) / (x2 + 8x + 16) = [(x - 5)(x + 4)] / (x + 4)2 = (x - 5) / (x + 4)
Assuming simplify = factor...x3 - 3x + 2 = (x-1)(x2+x-2)
x+5 is a factor of x2+4x-5 use synthetic division to learn that the other factor is x-1