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Mathematics 59 Online
Cupcake123456:

What is the sum of (–2.1x + 3.7) and (5 + 4.9x)? @dude @razor

dude:

(–2.1x + 3.7) + (5 + 4.9x)?

Cupcake123456:

are u asking me or what ?

dude:

When you say sum I think of \(\sum\) But not sure if you've done this

Cupcake123456:

8.7 2.8x + 8.7 ?

dude:

(–2.1x + 3.7) + (5 + 4.9x) You combine like terms \(2.8x +8.7\)

Cupcake123456:

11.5

dude:

No no, thats your answer, they cannot be combined \(2.8x+8.7\)

Cupcake123456:

i dont understand !

dude:

\((–2.1x + 3.7) + (5 + 4.9x)\) Okay so we can only add the numbers that have an x \(\color{red}{-2.1x+4.9x}\) and \(\color{blue}{3.7+5}\) = \(\color{red}{4.8x}+\color{blue}{8.7}\) These cannot be combined because they dont have an x

Cupcake123456:

o

dude:

Yeh

Cupcake123456:

now wat >

dude:

Thats it, that is your answer

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