Mister Exam
Factor x^2+3*x+4 squared
The solution
Factorization
[src]
/ ___\ / ___\ | 3 I*\/ 7 | | 3 I*\/ 7 | |x + - + -------|*|x + - - -------| \ 2 2 / \ 2 2 /
$$\left(x + \left(\frac{3}{2} - \frac{\sqrt{7} i}{2}\right)\right) \left(x + \left(\frac{3}{2} + \frac{\sqrt{7} i}{2}\right)\right)$$
(x + 3/2 + i*sqrt(7)/2)*(x + 3/2 - i*sqrt(7)/2)
The perfect square
Let's highlight the perfect square of the square three-member
$$\left(x^{2} + 3 x\right) + 4$$
To do this, let's use the formula
$$a x^{2} + b x + c = a \left(m + x\right)^{2} + n$$
where
$$m = \frac{b}{2 a}$$
$$n = \frac{4 a c - b^{2}}{4 a}$$
In this case
$$a = 1$$
$$b = 3$$
$$c = 4$$
Then
$$m = \frac{3}{2}$$
$$n = \frac{7}{4}$$
So,
$$\left(x + \frac{3}{2}\right)^{2} + \frac{7}{4}$$
$$\left(x^{2} + 3 x\right) + 4$$
To do this, let's use the formula
$$a x^{2} + b x + c = a \left(m + x\right)^{2} + n$$
where
$$m = \frac{b}{2 a}$$
$$n = \frac{4 a c - b^{2}}{4 a}$$
In this case
$$a = 1$$
$$b = 3$$
$$c = 4$$
Then
$$m = \frac{3}{2}$$
$$n = \frac{7}{4}$$
So,
$$\left(x + \frac{3}{2}\right)^{2} + \frac{7}{4}$$