mikevucina
how do i evaluate this expression: x(x + y) when x=2 1/2 and y= 3 3/4?



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bahrom7893
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just plug them in.

bahrom7893
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(5/2)*((5/2)+(15/4))

bahrom7893
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come on, you can finish the rest...

bahrom7893
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(5/2)*((15/4)  (10/4))

bahrom7893
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(5/2)*(5/4) = 25/8

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mikevucina do you get how to do it?

mikevucina
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i do know

mikevucina
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now

dgo
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do you know the order of operations?

mikevucina
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ye

dgo
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what comes first parentheses or multiplication? pop quiz lol

mikevucina
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parentheses

dgo
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nice

mikevucina
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okay 3x squared when x= 1.5 is 6.25?

dgo
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what comes first, exponents or multiplication?

mikevucina
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exponents

dgo
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btw im just learning this myself with you

mikevucina
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true

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bahrom do you square the integer first and then multiply by 3?

mikevucina
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square number first then integer i think

dgo
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i think you square the x (which is 1.5 and then multiply by 3

dgo
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unless its (3x)squared

mikevucina
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it is

dgo
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because parentheses comes before exponents

bahrom7893
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sorry where?

dgo
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3x squared when x= 1.5

bahrom7893
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depends on the parenthesis

mikevucina
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question is 3x squared + 5x  12 when x= 1.5

dgo
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are there parentheses?

mikevucina
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no

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so exponents come first, 1.5^2 = what?

mikevucina
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2.25

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so now rewrite the equation

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with the new piece of info

mikevucina
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6.75 + 5x  12

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boom, and we can go ahead and do the 5x, its 5 * 2.25

dgo
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oops

dgo
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i mean 5 *x or 5* 1.5

dgo
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can you do that and then rewrite the equation with the new info?

mikevucina
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the answer should be 19.25 but i got 11.25?

dgo
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hmmm, guess we need help, im asking bahrom

bahrom7893
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can you guys draw out the actual question?

dgo
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question is 3x2 + 5x  12 where x = 1.5

dgo
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3x^2

bahrom7893
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3*(1.5)^2+5*(1.5)12=
3*(2.25)5*(1.5)12

dgo
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howd you make it 5 in the second line?

bahrom7893
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6.757.512= 12.5

bahrom7893
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5*(1.5) that negative in front of 1.5 makes the whole thing negative

mikevucina
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answer is supposed to be 19.25

dgo
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ok, so that looks good. mike youre saying that the answer should be 19.25? thats weird, bahrom looks right to me, i mean it makes sense

bahrom7893
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dw:1329168853490:dw

mikevucina
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it says that in the book

mikevucina
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and bahroom thats the equation

bahrom7893
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the book's wrong

dgo
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mike does bahrom's answer make sense to you?

mikevucina
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ye it does

dgo
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if so, forget the book

dgo
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and show your teacher

dgo
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thanks bahrom, im giving him a medal for this, for sure

bahrom7893
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lol finally haha medals...

dgo
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lol win! good luck mike, cya around