20x2 = 41x+9
20x2-41x-9 = 0
(5x+1)(4x-9) = 0
Therefore: x = -1/5 or x = 9/4
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12 plus 9 equals 21.
144 9+7 = 16 and 9*16 = 144
The answer is 144. The compound operator for (a) and (b) in each pair is a * (a+b). For 9 and 7, this is 9 x (9+7) = 9 x 16 = 144.
The answer to the problem of 13 equals -4x plus 9 is x equals -1.
9 - 5n