resolving this question (X+6)(X-5)= X2+3X-53
(X + 6)(X - 5) = X^2 + 3X - 53
X^2 + 6x - 5x -30 = X^2 + 3X - 53
X^2 + X - 30 = X^2 + 3X - 53
X^2 + X - X^2 - 3X = -53 + 30
-2X = -23
X = 11.5
Check it.
(X + 6)(X - 5) = X^2 + 3X - 53
(11.5 + 6)(11.5 - 5) = 11.5^2 + 3(11.5) - 53
17.5 * 6.5 = 132.25 + 34.5 - 53
113.75 = 113.75