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16.10.2020 •
Mathematics
a different car can travel 30.5 miles for every gallon of gas used.use proportional reasoning to find the value of x that completes the table showing this relationship.
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Ответ:
from formula (a-b)^2= a^2 - 2ab+ b^2
the equation becomes
x^2 - 4x+4= 25
x^2-4x-21= 0
x^2 -7x+3x-21=0
x(x-7)+3(x-7)= 0
(x+3) (x-7)= 0
so either x+3=0
or x-7=0
x can have values x= -3, 7