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Algebra Level 1

What does $|x+y|$ equal to if $(x+y)^2 = 14400?$

4 solutions

Hung Woei Neoh
Jun 10, 2016

$|x+y| = \sqrt{(x+y)^2} = \sqrt{14400} = \boxed{120}$

J D
Jun 10, 2016

x+y could also be -120

Yes, but $|x+y|$ is still $120$

展豪張 - 5 years ago

thats why he wrote I x + y I .....

Harshendu Mahto - 4 years, 12 months ago

its not -14400, its 14400

Jonathan Lai - 4 years, 11 months ago

No, $(-120)^2=14400$

展豪張 - 4 years, 11 months ago

Christian Filemon
Jul 13, 2016

$\$Call me\$$

Jonathan Lai
Jun 10, 2016

Since the square root of 14400 in 120. You know that x+y equals 120.