U=2.
9
49
9
It is 5x + 8y, which cannot be factorised or simplified.
7 + 4u = 70 - 3u[add 3u to both sides]7 + 4u + 3u = 70 - 3u + 3u7 + 7u = 70 + 07 + 7u = 707u = 70 - 77u = 63u = 9
YOU CAN SOLVE FOR A VARIABLE IN AN EQUATION, BUT NOT AN EXPRESSION.. FOR EXAMPLE: RIGHT WAY: 4u+6=26 -6 -6 So you are left with 4u=20 now you divide the 4u by 4 because you want to do the opposite of multiplying. also, you divide the 20 by 4. So... u=5
16u3 + 84u2 + 80u factors to 4u(4u + 5)(u + 4)
(4u - 5)(2u - 1)
Add 3u to both sides. Subtract 7 from both sides. 7u = 63 u = 9
16
0