👉 Try now NerdPal! Our new math app on iOS and Android
  1. calculators
  2. Limits By Factoring

Limits by Factoring Calculator

Get detailed solutions to your math problems with our Limits by Factoring step-by-step calculator. Practice your math skills and learn step by step with our math solver. Check out all of our online calculators here.

Go!
Math mode
Text mode
Go!
1
2
3
4
5
6
7
8
9
0
a
b
c
d
f
g
m
n
u
v
w
x
y
z
.
(◻)
+
-
×
◻/◻
/
÷
2

e
π
ln
log
log
lim
d/dx
Dx
|◻|
θ
=
>
<
>=
<=
sin
cos
tan
cot
sec
csc

asin
acos
atan
acot
asec
acsc

sinh
cosh
tanh
coth
sech
csch

asinh
acosh
atanh
acoth
asech
acsch

1

Solved example of limits by factoring

$\lim_{x\to4}\left(\frac{x^2-16}{x^2+2x-24}\right)$
2

Factor the trinomial $x^2+2x-24$ finding two numbers that multiply to form $-24$ and added form $2$

$\begin{matrix}\left(-4\right)\left(6\right)=-24\\ \left(-4\right)+\left(6\right)=2\end{matrix}$
3

Thus

$\lim_{x\to4}\left(\frac{x^2-16}{\left(x-4\right)\left(x+6\right)}\right)$

Simplify $\sqrt{x^2}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $2$ and $n$ equals $\frac{1}{2}$

$\lim_{x\to4}\left(\frac{\left(x+\sqrt{16}\right)\left(\sqrt{x^2}-\sqrt{16}\right)}{\left(x-4\right)\left(x+6\right)}\right)$

Calculate the power $\sqrt{16}$

$\lim_{x\to4}\left(\frac{\left(x+4\right)\left(\sqrt{x^2}-\sqrt{16}\right)}{\left(x-4\right)\left(x+6\right)}\right)$

Simplify $\sqrt{x^2}$ using the power of a power property: $\left(a^m\right)^n=a^{m\cdot n}$. In the expression, $m$ equals $2$ and $n$ equals $\frac{1}{2}$

$\lim_{x\to4}\left(\frac{\left(x+4\right)\left(x-\sqrt{16}\right)}{\left(x-4\right)\left(x+6\right)}\right)$

Calculate the power $\sqrt{16}$

$\lim_{x\to4}\left(\frac{\left(x+4\right)\left(x- 4\right)}{\left(x-4\right)\left(x+6\right)}\right)$

Multiply $-1$ times $4$

$\lim_{x\to4}\left(\frac{\left(x+4\right)\left(x-4\right)}{\left(x-4\right)\left(x+6\right)}\right)$
4

Factor the difference of squares $x^2-16$ as the product of two conjugated binomials

$\lim_{x\to4}\left(\frac{\left(x+4\right)\left(x-4\right)}{\left(x-4\right)\left(x+6\right)}\right)$
5

Simplify the fraction $\frac{\left(x+4\right)\left(x-4\right)}{\left(x-4\right)\left(x+6\right)}$ by $x-4$

$\lim_{x\to4}\left(\frac{x+4}{x+6}\right)$
6

Evaluate the limit $\lim_{x\to4}\left(\frac{x+4}{x+6}\right)$ by replacing all occurrences of $x$ by $4$

$\frac{4+4}{4+6}$
7

Add the values $4$ and $6$

$\frac{4+4}{10}$
8

Add the values $4$ and $4$

$\frac{8}{10}$
9

Divide $8$ by $10$

$\frac{4}{5}$

Final Answer

$\frac{4}{5}$

Struggling with math?

Access detailed step by step solutions to thousands of problems, growing every day!