Question
2x cubed -4x sq.+ 8x -3 x=-2
Answers
Steve
f(x) = 2x^3 - 4x^2 + 8x - 3
so, if x = -2, just replace all the x's with (-2)'s:
f(-2) = 2(-2)^3 - 4(-2)^2 + 8(-2) - 3
= 2(-8) - 4(4) + 8(-2) - 3
= -16 - 16 - 16 - 3
= -51
Note how much clearer using ^ for powers is than all that wordy mumbo-jumbo.
so, if x = -2, just replace all the x's with (-2)'s:
f(-2) = 2(-2)^3 - 4(-2)^2 + 8(-2) - 3
= 2(-8) - 4(4) + 8(-2) - 3
= -16 - 16 - 16 - 3
= -51
Note how much clearer using ^ for powers is than all that wordy mumbo-jumbo.
Damon
2 x^3 - 4 x^2 + 5 x + 2 = 0 ??????
I suspect a typo and you do not say what you want. I assume roots.
using
http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php
x1=−0.31075
x2=1.15537+1.37229∗i
x3=1.15537−1.37229∗i
I suspect a typo and you do not say what you want. I assume roots.
using
http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php
x1=−0.31075
x2=1.15537+1.37229∗i
x3=1.15537−1.37229∗i
Damon
I did not understand your question.
Steve
since no question was posed, just a murky and cryptic expression.
Next time, SHAELYNNN, try to be it clear just what it is you need help with. We tend to ignore postings where we have to figure out the question as well as the answer!
Next time, SHAELYNNN, try to be it clear just what it is you need help with. We tend to ignore postings where we have to figure out the question as well as the answer!