-4 and 4
x = { +6, -6 }
x2+3=124 x2=121 x= square root(121) x=11
38
It will have two solutions because its a quadratic equation: x = -8.472135955 or x = 0.472135955
-4 and 4
x = { +6, -6 }
x2+3=124 x2=121 x= square root(121) x=11
sqrt 36 ie 6
An equation never equals a number, but its solution often does.-- An equation with a solution of six: [ 3x - 14 = 4 ]-- An equation with a solution of three: [ 14 - 10x = -16 ]-- An equation with both solutions: [ x2 - 9x + 20 = 2 ]An equation that equals 6 is 10 - 4 = 6An equation that equals 3 is 10 - 7 = 3
38
It will have two solutions because its a quadratic equation: x = -8.472135955 or x = 0.472135955
51
For the equation x2- 10x - k equals 0, you can solve this by knowing that if there is only one solution then the discriminant b2 - 4ac must be equal to 0. In this equation, a is 1, b is 10 and c is k This equation becomes 100 - 4k equals 0, and k is 25.
x2 + 3x - 10 = (x + 5)(x - 2) ⇒ x = -5 or 2
The discriminant is 36 which means the quadratic equation has two solutions which are 5 and -1
The equation is -x2 - 4 = 14 or -x2 = 18 which is the same as x2 = -18. That is the quadratic equation.