Q. Let h(x)=x+7−3x−2 when x=2.h is continuous for all x>−7.Find h(2).Choose 1 answer:(A) 2(B) 6(C) −3(D) 4
Recognize the undefined point: Recognize that the function h(x) is not defined at x=2 because it would result in a division by zero. However, we are asked to find the limit as x approaches 2, which will give us the continuous value of h(x) at x=2.
Rationalize the denominator: To find the limit of h(x) as x approaches 2, we can use the conjugate of the denominator to rationalize it. Multiply the numerator and the denominator by the conjugate of the denominator, which is (x+7+3).
Multiply numerator and denominator: Perform the multiplication from Step 2:h(x)=(x+7−3)(x+7+3)(x−2)(x+7+3)
Simplify the denominator: Simplify the denominator using the difference of squares formula:Denominator = (x+7)2−(3)2=x+7−9=x−2
Simplify the numerator: Simplify the numerator by distributing x−2 to x+7+3:Numerator=xx+7+3x−2x+7−6
Cancel out common terms: Notice that the denominator (x−2) cancels out with the (x−2) term in the numerator, leaving us with:h(x)=(x+7+3)
Substitute x=2: Now, substitute x=2 into the simplified h(x) to find h(2):h(2)=2+7+3=9+3=3+3=6