Let the cubic polynomial be
P(x)=Ax³ + Bx² + Cx + D
"The leading coefficient of a cubic polynomial P is 2", so A=2.
"and the coefficient of the linear term is -5.", so C=-5
P(0)=7, i.e. when x=0, P(0)=7, so D=7.
The only unknown is B.
P(x)= 2x³ + Bx² -5x + 7
"P(2)=21". If we substitute x=2, we obtain P(2)=4B+13 = 21
The polynomial is now completely determined:
P(x)= 2x³ + 2x² -5x + 7
how do you convert 18 miles to meters?
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