Write an exponential function in the form y, equals, a, b, to the power xy=ab x that goes through the points left parenthesis, 0, comma, 7, right parenthesis(0,7) and left parenthesis, 2, comma, 567, right parenthesis(2,567).
Question
Write an exponential function in the form y, equals, a, b, to the power xy=ab x that goes through the points left parenthesis, 0, comma, 7, right parenthesis(0,7) and left parenthesis, 2, comma, 567, right parenthesis(2,567).
Solution
The general form of an exponential function is y = ab^x.
We know that the function passes through the points (0,7) and (2,567).
We can use these points to form two equations and solve for a and b.
From the point (0,7), we substitute x = 0 and y = 7 into the equation to get:
7 = ab^0 Since any number to the power of 0 is 1, we get a = 7.
Now we know that a = 7, we can use the second point (2,567) to find b. Substituting x = 2, y = 567, and a = 7 into the equation, we get:
567 = 7b^2 To solve for b, we first divide both sides by 7 to get:
81 = b^2 Then, we take the square root of both sides to get:
b = 9
So, the exponential function that goes through the points (0,7) and (2,567) is y = 7*9^x.
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