[QUOTE=Dragonballful23;44096]Easy quadratics
(solve for x)
1) x^2-3x+2
Splitting middle term of quadratic
x^2-x-2x+2
x(x-1)-2(x-1)
(x-1)(x-2)
x=1 and x=2.
2)x^2-4x+2
The Quadratic Formula:
For ax^2 + bx + c = 0, the value of x is given by:
x = [ -b ± sqrt(b^2 - 4ac) ] / 2a
a=1 , b= -4 , c= 2
x = [ 4 ± sqrt(-4^2 - 4*1*2) ] / 2*1
x = [ 4 ± sqrt(16 - 8) ] / 2
x = [ 4 ± sqrt(8) ] / 2
x = [ 4 ± 2 sqrt(2) ] / 2
x = [ 2 ± sqrt(2) ]
x = [ 2 + sqrt(2) ] and x = [ 2 - sqrt(2) ]
3) 2x^2-5x+2
Splitting middle term of quadratic
2x^2-4x-x+2
2x(x-2)-1(x-2)
(x-2)(2x-1)
x = 2 and x = 1/2
