Question

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

Answer 1

just plug them in.

Answer 2

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

Answer 3

come on, you can finish the rest...

Answer 4

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

Answer 5

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

Answer 6

mikevucina do you get how to do it?

Answer 7

i do know

Answer 8

now

Answer 9

do you know the order of operations?

Answer 10

ye

Answer 11

what comes first parentheses or multiplication? pop quiz lol

Answer 12

parentheses

Answer 13

nice

Answer 14

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

Answer 15

what comes first, exponents or multiplication?

Answer 16

exponents

Answer 17

btw im just learning this myself with you

Answer 18

true

Answer 19

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

Answer 20

square number first then integer i think

Answer 21

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

Answer 22

unless its (3x)squared

Answer 23

it is

Answer 24

because parentheses comes before exponents

Answer 25

sorry where?

Answer 26

3x squared when x= -1.5

Answer 27

depends on the parenthesis

Answer 28

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

Answer 29

are there parentheses?

Answer 30

no

Answer 31

so exponents come first, -1.5^2 = what?

Answer 32

2.25

Answer 33

so now rewrite the equation

Answer 34

with the new piece of info

Answer 35

6.75 + 5x - 12

Answer 36

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

Answer 37

oops

Answer 38

i mean 5 *x or 5* -1.5

Answer 39

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

Answer 40

the answer should be 19.25 but i got 11.25?

Answer 41

hmmm, guess we need help, im asking bahrom

Answer 42

can you guys draw out the actual question?

Answer 43

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

Answer 44

3x^2

Answer 45

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

Answer 46

howd you make it -5 in the second line?

Answer 47

6.75-7.5-12= -12.5

Answer 48

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

Answer 49

answer is supposed to be 19.25

Answer 50

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