CPM Homework Help : CCA Problem 10-81

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Home > CCA > Chapter 10 > Lesson 10.2.5 > Problem 10-81

10-81.

Use square roots to find both solutions to each equation.

$x^2−81=0$
Step 1(a):
Add $81$ to both sides.
Step 2(a):
Square root both sides.
More Help (a):
This equation has $x^2$ , so you should be looking for two possible solutions.
Answer (a):
$x=\pm9$

$x^2−37=0$
Hint (b):
Use the same method as part (a). Is $37$ a perfect square?
Answer (b):
$x=\pm \sqrt{37}$

$x^2+49=0$
Hint (c):
Use the same method as parts (a) and (b).
Answer (c):
$x=\pm \sqrt{-49}$

$2x^2+10=0$
Hint (d):
One method would be to start by dividing the equation by $2$ .
Answer (d):
$x=\pm \sqrt{-5}$

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