Some signs would have helped answerers but for what its worth 7 & 8 are factors of 56 which differ by 1 so how about: (y - 7x)(y + 8x) which are the factors of y2 + xy - 56x2 or (y + 7x)(y - 8x) which are the factors of y2 - xy - 56x2.
2/7x = 8x = 8 x 7/2x = 28
80
Complementary angles add up to 90 degrees so if y = 8x-20 degrees then the complement of y is 90 - (8x - 20) = 110 - 8x degrees.
This would be easier with operational signs but assuming everything is added together, the answer is (8x + 9)(8x + 9) or (8x + 9)2
-8x+7 = -7x-2 -8x = -7x-2-7 -8x=-7x-9 -8x+7x=-9 -1x=-9 x=-9/-1 x=9
8x=7x-7 x=-7
Do you mean 6x+7x-8x if so it is 5x because 13x-8x = 5x
It is: 7x
28=8x+12-7x 28=8x-7x+12 28=x+12 28-12=x+12-12 16=x
8x-2 = -9+7x8x-7x = -9+2x=-7
7x+x = 8x
x = 4 You have to add the 8x and 7x to get 15x and then divide 60 by 15 to get x by itself.
If you mean: 5x(3x+2)-8x-7x then the expression can be simplified to 15x^2 -5x
56x2
It is 7+8x simplified
8x-1 = 7x+2 Add 1 to both sides: 8x = 7x+3 Subtract 7x from both sides: 1x = 3 ie x = 3