shady1095
22.08.2020 •
Mathematics
The result of trebling a number and subtracting 5 is the same as doubling the number and adding 9 what is the number
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Ответ:
0=3x^2+17x-160
Step-by-step explanation:
Area = Width × Length
Width = x + 5
Length = 3x + 2
(x + 5) × (3x + 2)
use rainbow method
3x × x = 3x^2
3x × 5 = 15x
2 × x = 2x
2 × 5 = 10
3x^2 + 17x + 10 = 170
subtract 170 from both sides
3x^2 + 17x + 10 - 170 = 0
0 = 3x^2 + 17x - 160