anonymous
  • anonymous
how do i evaluate this expression: x(x + y) when x=-2 1/2 and y= 3 3/4?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
bahrom7893
  • bahrom7893
just plug them in.
bahrom7893
  • bahrom7893
(-5/2)*((-5/2)+(15/4))
bahrom7893
  • bahrom7893
come on, you can finish the rest...

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More answers

bahrom7893
  • bahrom7893
(-5/2)*((15/4) - (10/4))
bahrom7893
  • bahrom7893
(-5/2)*(5/4) = -25/8
anonymous
  • anonymous
mikevucina do you get how to do it?
anonymous
  • anonymous
i do know
anonymous
  • anonymous
now
anonymous
  • anonymous
do you know the order of operations?
anonymous
  • anonymous
ye
anonymous
  • anonymous
what comes first parentheses or multiplication? pop quiz lol
anonymous
  • anonymous
parentheses
anonymous
  • anonymous
nice
anonymous
  • anonymous
okay 3x squared when x= -1.5 is 6.25?
anonymous
  • anonymous
what comes first, exponents or multiplication?
anonymous
  • anonymous
exponents
anonymous
  • anonymous
btw im just learning this myself with you
anonymous
  • anonymous
true
anonymous
  • anonymous
bahrom do you square the integer first and then multiply by 3?
anonymous
  • anonymous
square number first then integer i think
anonymous
  • anonymous
i think you square the x (which is -1.5 and then multiply by 3
anonymous
  • anonymous
unless its (3x)squared
anonymous
  • anonymous
it is
anonymous
  • anonymous
because parentheses comes before exponents
bahrom7893
  • bahrom7893
sorry where?
anonymous
  • anonymous
3x squared when x= -1.5
bahrom7893
  • bahrom7893
depends on the parenthesis
anonymous
  • anonymous
question is 3x squared + 5x - 12 when x= -1.5
anonymous
  • anonymous
are there parentheses?
anonymous
  • anonymous
no
anonymous
  • anonymous
so exponents come first, -1.5^2 = what?
anonymous
  • anonymous
2.25
anonymous
  • anonymous
so now rewrite the equation
anonymous
  • anonymous
with the new piece of info
anonymous
  • anonymous
6.75 + 5x - 12
anonymous
  • anonymous
boom, and we can go ahead and do the 5x, its 5 * 2.25
anonymous
  • anonymous
oops
anonymous
  • anonymous
i mean 5 *x or 5* -1.5
anonymous
  • anonymous
can you do that and then rewrite the equation with the new info?
anonymous
  • anonymous
the answer should be 19.25 but i got 11.25?
anonymous
  • anonymous
hmmm, guess we need help, im asking bahrom
bahrom7893
  • bahrom7893
can you guys draw out the actual question?
anonymous
  • anonymous
question is 3x2 + 5x - 12 where x = -1.5
anonymous
  • anonymous
3x^2
bahrom7893
  • bahrom7893
3*(-1.5)^2+5*(-1.5)-12= 3*(2.25)-5*(1.5)-12
anonymous
  • anonymous
howd you make it -5 in the second line?
bahrom7893
  • bahrom7893
6.75-7.5-12= -12.5
bahrom7893
  • bahrom7893
5*(-1.5) that negative in front of -1.5 makes the whole thing negative
anonymous
  • anonymous
answer is supposed to be 19.25
anonymous
  • anonymous
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
  • bahrom7893
|dw:1329168853490:dw|
anonymous
  • anonymous
it says that in the book
anonymous
  • anonymous
and bahroom thats the equation
bahrom7893
  • bahrom7893
the book's wrong
anonymous
  • anonymous
mike does bahrom's answer make sense to you?
anonymous
  • anonymous
ye it does
anonymous
  • anonymous
if so, forget the book
anonymous
  • anonymous
and show your teacher
anonymous
  • anonymous
thanks bahrom, im giving him a medal for this, for sure
bahrom7893
  • bahrom7893
lol finally haha medals...
anonymous
  • anonymous
lol win! good luck mike, cya around

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