Question

Choose the value for x that makes the open sentence true.

5 + 4 ● x = 32 + x2

(Points : 1)
5
4
3
2

Answer 1

is the dot for multiplication , and is that last part 2*x or x^2?

Answer 2

yes the dot is for mutiplication and the last part is x^2

Answer 3

acually the last part is x to the second power

Answer 4

sorry, but for 5 + 4x = 32 + x^2, none of those answers fit

Answer 5

what

Answer 6

what answer did u get

Answer 7

move the numbers to one side

x^2 - 4x + 27(32-5) = 0

quadratic equation formula
ax^2 + bx + c = 0

x = (-b (+/-) sqrt(b^2 - 4ac))/2a
(plus or minus)
a = 1, b = -4, c = 27


x = (4 + sqrt(16 - 108)) / 2
x = (4 - sqrt(16 - 108)) / 2
16 - 108 = -92
square root of a nefative number is "complex", signified by an "i" in the answer

x = ( 4 + sqrt(92)i ) / 2
x = ( 4 - sqrt(92)i ) / 2

x = ( 4 - 9.59i ) / 2
x = ( 4 + 9.59i ) / 2

x = ( -5.59i ) / 2
x = ( 13.59i ) / 2

x = -2.79i or 6.795
(you always have 2 answers for quadratic equations)