Find the real solutions if any for the following equation Us
Find the real solutions, if any, for the following equation. Use any method.
x squared plus xx2+xequals=4
Solution
x^2 + x = 4
subtracting 4 from both sides
x^2 + x - 4 = 0
applying quadratic formula to find the solutions
x = { -b + - sqrt (b^2 - 4ac )} / 2a
a = 1 , b = 1 , c = -4
plugging the values in the formula we get
x = { - 1 + - sqrt (1^2 - 4*1 *-4) } / 2
x = { -1 + - sqrt 17 } / 2
two solutions are
x1 = { -1 + sqrt 17 } / 2
x2 = { -1 - sqrt 17 } / 2
