anthonycraig0205
03.06.2020 •
Mathematics
The width of a rectangle is 7 units less than the length. The area of the rectangle is 18 units. What is the length, in units, of the rectangle?
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Ответ:
let f(x) = 6x^2 + 5 and g(x) = 3x-5.
f(g(x))=f(3x-5)=6(3x-5)²+5=6(9x²-30x+25)-5
=54x²-180x+150-5=54x²-180x+145
again
f(g(7))=54×7²-180×7+145
=1531 is your answer