datbih12345
29.06.2019 •
Mathematics
Find the area of a rectangle with length (2x + 3) and width (x - 4). a) 2x2 - 11x - 12 b) 2x2 - 5x + 12 c) 2x2 + 11x + 12 d) 2x2 - 5x - 12
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Ответ:
Area = 2x^2 -5x-12
Step-by-step explanation:
Area = length * width
Area = (2x+3) * (x-4)
We will use the FOIL technique to multiply the terms.
First: 2x*x = 2x^2
Outer: 2x* -4 = -8x
Inner: 3*x = 3x
Last = 3* -4 = -12
Add the 4 terms together: 2x^2 -8x+3x -12 = 2x^2 -5x-12
Area = 2x^2 -5x-12
Ответ:
2a. X=10.9
2b. C=47/5 or 9.4
3a. X=32.6
3b. X=55.7
I hope these helped