2x

Bring the coefficient of x

2(x

2(x +

2(x +

Note : 2 x (

^{2}+ 10x + 7 = 0Bring the coefficient of x

^{2}to 1 by dividing throughout by 2.2(x

^{2}+ 5x +^{7}/_{2}) = 0 Note : (x + h)^{2}= x^{2}+ 2hx + h^{2}...so h = half the coefficient of x2(x +

^{5}/_{2})^{2 }-^{22}/_{4}= 02(x +

^{5}/_{2})^{2}-^{11}/_{2}= 0Note : 2 x (

^{5}/_{2})^{2 }= 2 x^{25}/_{4}=^{50}/_{4}but we only require a value of 7 =^{28}/_{4}so we need to subtract^{22}/_{4}