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, 3, right parenthesis(0,3) and left parenthesis, 2, comma, 243, right parenthesis(2,243).
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, 3, right parenthesis(0,3) and left parenthesis, 2, comma, 243, right parenthesis(2,243).
Solution
The general form of an exponential function is y = ab^x.
We know that the function passes through the points (0,3) and (2,243).
We can use these points to form two equations and solve for a and b.
From the point (0,3), we substitute x = 0 and y = 3 into the equation:
3 = ab^0 Since any number to the power of 0 is 1, we get a = 3.
Now, we substitute a = 3 into the equation and use the point (2,243):
243 = 3b^2 Divide both sides by 3 to solve for b^2:
81 = b^2 Take the square root of both sides to solve for b:
b = 9
So, the exponential function that passes through the points (0,3) and (2,243) is y = 3*9^x.
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