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Math Snap
PROBLEM
Evaluate limx→7x2−49x+2−3
STEP 1
1. We are given the limit expression limx→7x2−49x+2−3. 2. We need to evaluate this limit as x approaches 7.
STEP 2
1. Substitute x=7 into the expression to check for indeterminate form. 2. Simplify the expression using algebraic techniques. 3. Re-evaluate the limit after simplification.
STEP 3
Substitute x=7 into the expression: 72−497+2−3=49−499−3=03−3=00The expression is in the indeterminate form 00.
STEP 4
Simplify the expression by rationalizing the numerator. Multiply the numerator and the denominator by the conjugate of the numerator: x2−49x+2−3⋅x+2+3x+2+3=(x2−49)(x+2+3)(x+2−3)(x+2+3)
STEP 5
Simplify the numerator using the difference of squares: (x+2−3)(x+2+3)=(x+2)2−32=x+2−9=x−7
STEP 6
Factor the denominator: x2−49=(x−7)(x+7)
STEP 7
Substitute the simplified numerator and denominator back into the expression: (x−7)(x+7)(x+2+3)x−7Cancel the common factor (x−7): (x+7)(x+2+3)1
SOLUTION
Re-evaluate the limit as x approaches 7: x→7lim(x+7)(x+2+3)1=(7+7)(7+2+3)1Simplify: =14×(3+3)1=14×61=841The value of the limit is: 841