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, 16, right parenthesis(0,16) and left parenthesis, 5, comma, 512, right parenthesis(5,512).
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, 16, right parenthesis(0,16) and left parenthesis, 5, comma, 512, right parenthesis(5,512).
Solution
The general form of an exponential function is y = ab^x.
We know that the function passes through the points (0,16) and (5,512).
We can use these points to form two equations and solve for the values of a and b.
From the point (0,16), we substitute x = 0 and y = 16 into the equation to get:
16 = ab^0 Since any number to the power of 0 is 1, we get a = 16.
Now we know the value of a, we can use the second point (5,512) to find the value of b. We substitute x = 5, y = 512 and a = 16 into the equation to get:
512 = 16b^5 Divide both sides by 16 to get: 32 = b^5 Take the fifth root of both sides to get: b = 2
So, the exponential function that passes through the points (0,16) and (5,512) is y = 16*2^x.
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