1.5*(-2.3)*5
-3.45*5 =
answer -17.25
(-55.7) + 27.6 + (-3.4)
-55.7 + 27.6 - 3.4
-28.1 - 3.4
answer -31.5
2/5 - 1/2
the only way i know how to do this is to divide by the LCD.
is the answer -1/10 by finding the LCD and add.
2/10 - 1/10 = -1/10 if this isn't correct, i don't know!
\(\displaystyle ***\)
\(\displaystyle Note:\) Your answer is correct, but your work is wrong.
You can multiply and divide by 10 at the same time:
\(\displaystyle (\frac{10}{10})(\frac25) - (\frac{10}{10})(\frac12) = \frac{1}{10}(\frac{20}{5} - \frac{10}{2}) = \frac{1}{10}(\frac{4 - 5}{1}) = -\frac{1}{10}\)
simplify
-12 + 7^2 - (7)*2
-12 + 7^2 - 14
-12 + 49 - 14
61 - 14
answer 47 is this correct
\(\displaystyle ***\)\(\displaystyle No, -12 + 49 -14 = 37 - 14 = 23\)
5^2*(-10) + (-11)*8
25*(-10) - 11*8
-250 - 88
-338 is this correct?
\(\displaystyle *** Yes.\)
5*(-8 - 1) + 3*(-7)
5*(-9) + 3*(-7)
-45 - 21
answer -66 is this correct?
\(\displaystyle *** Yes.\)
4*(2 + 3)^2 - 3*(5 - 3)^2
4*(5)^2 - 3*(2)^2
4*25 - 3*4
100 - 12
88 is this correct?
\(\displaystyle *** Yes.\)
what in the world!
4m^2 - 2mn + 3n^2 - 8(2m^2 + 4mn - 9n^2)
\(\displaystyle Note:\) The exponents are on the variables, not also the coefficients.
The expression inside the parantheses does not get altered until the \(\displaystyle -8\)
is distributed to all of the terms inside and the parentheses dropped.
\(\displaystyle 4m^2 - 2mn + 3n^2 - 16m^2 - 32mn + 72n^2\)
\(\displaystyle (4m^2 - 16m^2) + (-2mn - 32mn) + (3n^2 + 72n^2)\)
\(\displaystyle -12m^2 -34mn + 75n^2\)
4m^2 - 2mn + 3n^2 - 8(4m + 4mn - 81n)
4m^2 - 2mn + 3n^2 - 8(8m^2n - 81n)
4m^2 - 2mn + 3n^2 - 8(-73m^2)
16m - 2mn + 9n - 8(-73m^2)
14mn + 9n - 8(-73m^2)
23mn^2 - 8(-73m^2)
15mn^2(-73m^2)
-1095m^3n oh please tell me if this brain buster is correct?
