We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.

+0

# Help. ​

0
390
4

Help. Feb 1, 2018

### 4+0 Answers

#1
+1

2)

Solve for x:

4(3 - x)^4/3 - 5 = 59       add 5 to both sides

4(3 - x)^4/3 = 64            divide both sides by 4

(3 - x)^4/3 = 16              raise both sides to 3rd power

(x - 3)^4 = 4096

Taking 4^th roots gives 8 times the 4^th roots of unity:

x - 3 = -8 or x - 3 = -8 i or x - 3 = 8 i or x - 3 = 8

Add 3 to both sides:

x = -5 or x - 3 = -8 i or x - 3 = 8 i or x - 3 = 8

Add 3 to both sides:

x = -5 or x = 3 - 8 i or x - 3 = 8 i or x - 3 = 8

Add 3 to both sides:

x = -5 or x = 3 - 8 i or x = 3 + 8 i or x - 3 = 8

Add 3 to both sides:

x = -5 or x = 3 - 8 i or x = 3 + 8 i or x = 11 - Discard the imaginary solutions:

x = -5       and          x = 11

Feb 1, 2018
#2
+1

1.   Not too bad,  NSS

√[ x + 10 ] - 9  = 7   add  9 to both sides

√ [ x + 10 ]   =  2        square both sides

x + 10  =  4       subtract 10 from both sides

x  = -6   Feb 1, 2018
edited by CPhill  Feb 1, 2018
edited by CPhill  Feb 1, 2018
#3
+1

would 2 be A??

NotSoSmart  Feb 1, 2018