Q. Three points on the graph of the function f(x) are {(0,5),(1,6),(2,9)}. Which equation represents f(x) ?f(x)=x2+5f(x)=x+5f(x)=5⋅(56)xf(x)=3x+3
Substitution Testing: To determine which equation represents the function f(x), we will substitute each given point into each of the proposed equations and check for consistency.
Point (0,5): First, let's test the point (0,5) in each equation.For f(x)=x2+5, when x=0, f(0)=02+5=5.For f(x)=x+5, when x=0, f(0)=0+5=5.For f(x)=5×(6/5)x, when x=0, f(0)=5×(6/5)0=5×1=5.For f(x)=x2+50, when x=0, f(x)=x2+52.The first three equations are consistent with the point (0,5), but the last one is not.
Point (1,6): Next, let's test the point (1,6) in the remaining equations.For f(x)=x2+5, when x=1, f(1)=12+5=6.For f(x)=x+5, when x=1, f(1)=1+5=6.For f(x)=5×(6/5)x, when x=1, (1,6)0.All three equations are consistent with the point (1,6).
Point (2,9): Finally, let's test the point (2,9) in the remaining equations.For f(x)=x2+5, when x=2, f(2)=22+5=4+5=9.For f(x)=x+5, when x=2, f(2)=2+5=7.For f(x)=5×(6/5)x, when x=2, (2,9)0.Only the first equation, f(x)=x2+5, is consistent with the point (2,9).
Final Equation Determination: Since only the equation f(x)=x2+5 is consistent with all three given points, this is the equation that represents the function f(x).
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