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, 10, right parenthesis(0,10) and left parenthesis, 2, comma, 490, right parenthesis(2,490).Answer
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, 10, right parenthesis(0,10) and left parenthesis, 2, comma, 490, right parenthesis(2,490).Answer
Solution
The general form of an exponential function is y = ab^x.
We know that the function passes through the points (0,10) and (2,490).
We can use these points to form two equations and solve for a and b.
From the point (0,10), we substitute x = 0 and y = 10 into the equation to get:
10 = ab^0 Since any number to the power of 0 is 1, we get a = 10.
Now we know that a = 10, we can use the second point (2,490) to find b. Substituting x = 2, y = 490 and a = 10 into the equation, we get:
490 = 10b^2 Divide both sides by 10 to isolate b^2:
49 = b^2 Taking the square root of both sides, we find that b = 7.
So, the exponential function that passes through the points (0,10) and (2,490) is y = 10*7^x.
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