joelpimentel joelpimentel

20-05-2018
Mathematics

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PLEASE ANSWER + BRAINLIEST!!

Find the value of c that completes the square.

x^2 + 42x + c _

x^2 - 18x + c _

Respuesta :

Аноним Аноним

20-05-2018

x^2 + 42x + 441

x^2 - 18x + 81

Answer Link

altavistard altavistard

20-05-2018

Let's actually complete the square for x^2 + 42x + c ...

x^2 + 42 + (42/2)^2 - (42/2)^2
becomes
(x+21)^2 - 21/2 (answer)

alternatively, (x+21)^2 - 10.5

Answer Link

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