Question

if a=-1 and b=5 what is 5a-7b+b^2 isnt it 55
and also i can not figure out 9xy^2-11xy^2

Answer 1

5* -1 - 7* 5 + 5^2 = ?

Answer 2

55

Answer 3

no
take the first 2 terms
-1* 5 - 7*5
= -5 - 35 = ?

Answer 4

Just plug in the values and follow the Order of Operations

P - Do what is in the PARENTHESIS first
E - Now do the exponent(s)
M/D - Do multiplication or division in the order starting from the LEFT side of the equation and end at the RIGHT of the equation
A/S Do addition or subtraction in the order starting from the LEFT side of the equation and end at the RIGHT of the equation

Answer 5

-40

Answer 6

right now its -40 + 5^2
now as sammixboo indicated do the exponent part first ( the 5^2) then add

Answer 7

ok?

Answer 8

what is 5^2?

Answer 9

25

Answer 10

-15 is the answer i got....

Answer 11

ok now we have
-40 + 25 = ?

Answer 12

right

Answer 13

now 9xy^2-11xy^2

Answer 14

@cwrw238

Answer 15

i guess you want to simplify this
notice that these are 2 like terms
they both have xy^2 in them

9 - 11 = -2

so 9xy^2 - 11xy^2 = ?