Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).x→∞lim10x2+7x3348x5+x6−39x2Answer:
Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).x→∞lim10x2+7x3348x5+x6−39x2Answer:
Simplify expression by factoring: We are given the limit: x→∞lim(10x2+7x3348x5+x6−39x2) Step 1: Simplify the expression inside the cube root by factoring out the highest power of x common to all terms.
Focus on highest power terms: Since x is approaching infinity, we can focus on the terms with the highest power of x in the numerator and the denominator.In the numerator, the term with the highest power of x is x6, and in the denominator, it is x3.We can factor x5 out of the cube root in the numerator to simplify the expression.348x5+x6−39x2=3x5(x+48−39/x3)
Factor out highest power of x: Simplify the expression in the denominator by factoring out the highest power of x common to all terms.10x2+7x3=x2(10+7x)
Rewrite limit with simplified expressions: Now we rewrite the limit with the simplified expressions. limx→∞(3x5(x+48−x339))/(x2(10+7x))
Divide by x2: We can now divide both the numerator and the denominator by x2.x→∞lim⎝⎛x23x5(x+48−x339)⎠⎞/(10+7x)
Simplify expression inside cube root: Simplify the expression inside the cube root by canceling out x2.3x2x5(x+48−x339)=3x3(x+48−x339)
Take x out of cube root: Since we have a cube root, we can take x3 out of the cube root.3x3(x+48−x339)=x⋅3x+48−x339
Rewrite limit with x taken out: Now we rewrite the limit with the x taken out of the cube root. limx→∞(10+7xx⋅3x+48−x339)
Negligible terms as x approaches infinity: As x approaches infinity, the terms 48 and −x339 inside the cube root become negligible compared to x. Similarly, the term 10 in the denominator becomes negligible compared to 7x.x→∞lim(7xx⋅3x)
Cancel out x in numerator and denominator: Simplify the expression by canceling out x in the numerator and denominator.x→∞lim(73x)
Cube root of x approaches infinity: As x approaches infinity, the cube root of x also approaches infinity.limx→∞(3x)/7=∞/7
Limit of constant divided by infinity: The limit of a constant divided by infinity is 0.limx→∞(3x)/7=0