x = plus or minus 6.
x2 + 13x + 36 = 0 so (x+4)(x+9) = 0 so that x = -4 or x = -9
(x + 4)(x +4) or (x + 4)squared
If: -8x+4 = 36 then the value of x works out as -4 Check: -8*(-4)+4 = 36
5x + 36 = x Subtract x from both sides: 4x + 36 = 0 Subtract 36 from both sides: 4x = -36 Divide both sides by 4: x = -9
2x + 4 = 362x = 36 - 42x = 32x = 32/2X = 16
5 x 16 + 4 x 9 = 80 + 36 = 116
x + 36 = 82x = 82 - 36x = 46
x = 14
x=-1.6
x = plus or minus 6.
x = -13
If: x+16 = 9x then x = 2
x=6
x = -14
16
We have 3x+9y=36, or equivalently 12x+36y=144. We also have 12x+4y=18, so subtracting these we have 32y=126 or y=63/16. Substituting this into our original equation leaves 3x=36-9*63/16 or x = 12-3*63/16 = 3/16. So: x=3/16, y=63/16