△abc is similar to △lmn by the aa similarity postulate . the measure of ∠a is 57º and m∠c=2(m∠m).
what is m∠m?
y = 7x.
x =12 and y =9
3x -18 = 2y or 3x -2y = 18
5x-6y = 6
using elimination method
in order make coefficient of y in both equation same with different sign ,
we multiply equation 1 by -3 and adding the obtained to equation 2
-3(3x-2y) = 18x-3
-9x +6y = -54
5x -6y = 6
-4x = -48
on plugging the value of y in equation (1) ,we get
3(12) -18 = 2y
36 -18 = 2y
2y = 18
y = 18/2 = 9
x = 12 and y = 9
group the first two and do foil like normal ignoring the "(x-3)"
you should end up with the answer x^2-16
now multiply (x^2-16) with (x-3)
that answer should be x^3-3x^2-16x+48