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August 21, 2014

August 21, 2014

Posted by **please help!** on Monday, June 18, 2012 at 12:01pm.

1.) Lim

x-> 1

x^2+x-2/x^2-x

2.) (please note that the -2 is not under the square root)

Lim

x->0

sqroot 4+h -2/ h

- math -
**MathMate**, Monday, June 18, 2012 at 1:58pmWhenever transcribing fractions, do not forget to insert parentheses around numerator AND denominator. The posted expressions do not evaluate into what you wanted to do.

1.

Factor numerator and denominator.

Reduce expression by cancelling common factors.

Evaluate remaining expression.

(x²+x-2)/(x²-x)

=(x+2)(x-1)/(x(x-1))

=(x+2)/(x)

evaluate limit for x → 1.

2.

Multiply top and bottom by conjugate, cancel out common factor and evaluate limit.

(√(4+h)-2)/(h)

=(√(4+h)-2)(√(4+h)+2)/((h)(√(4+h)+2))

=(4+h-2²)/(h(√(4+h)+2))

=h/(h(√(4+h)+2))

=1/(√(4+h)+2)

evaluate expression as x→0

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