The key idea
The key idea
When the coefficient of x2x^2x2 is 1, you can often factorise by inspection. When it is not 1, as in 2x2+7x+32x^2 + 7x + 32x2+7x+3, splitting the middle term is the reliable method.
The key idea
The key idea
When the coefficient of x2x^2x2 is 1, you can often factorise by inspection. When it is not 1, as in 2x2+7x+32x^2 + 7x + 32x2+7x+3, splitting the middle term is the reliable method.