Q. Let g(x)=x−4−1x−5 when x=5.g is continuous for all x>4.Find g(5).Choose 1 answer:(A) 2(B) 8(C) 10(D) 5
Define Limit of g(5): To find the value of g(5), we need to evaluate the limit of g(x) as x approaches 5, because g(x) is not defined at x=5 but is continuous for all x > 4. This suggests that we should use the limit process to find g(5).
Simplify Expression by Conjugate: We can simplify the expression for g(x) by multiplying the numerator and denominator by the conjugate of the denominator to eliminate the square root in the denominator. The conjugate of x−4−1 is x−4+1.
Multiply Numerator and Denominator: Multiplying the numerator and denominator by the conjugate, we get:g(x) = (x−4−1)(x−4+1)(x−5)(x−4+1)
Simplify Denominator: Simplifying the denominator using the difference of squares, we get: g(x)=(x−4)−1(x−5)(x−4+1)
Further Simplify Denominator: Further simplifying the denominator, we get: g(x)=x−5(x−5)(x−4+1)
Cancel Out Common Term: We can now cancel out the (x−5) term in the numerator and denominator, as long as x is not equal to 5. This is valid because we are interested in the limit as x approaches 5, not the value at x=5.
Final Simplified Expression: After canceling out the (x−5) term, we are left with:g(x)=x−4+1
Substitute x=5: Now we can safely substitute x=5 into the simplified expression to find g(5):g(5)=5−4+1
Calculate Final Value: Calculating the square root and adding 1, we get:g5 = 1 + 1 = 1 + 1 = 2