Factorising -x2 + 7x + 18:
(a - x)(x + b) = -x2 + (b - a)x + ab
so ab = 18, b - a = 7 giving a = 2, b = 9:
(2 - x)(x + 9)
Chat with our AI personalities
9x+6 = 7x+18 9x-7x = 18-6 2x = 12 x = 6
It is a pair of expressions -24 and 7x + 18 which are unrelated to one another.
-(x - 9)(x + 2)
It is an equation and the value of x is 2
Do you mean: 5x + 9 - 7x + 6 = x - 18 If so, you can solve this question at this manner: -2x + 15 = x - 18 3x = -3 x = -1