So that means we need four hybrid orbitals. So that means we have to use the two x and all the three P, x's, y's and Z's to form our four hybrid orbitals. In other words, for hybridization to take place, the two S must combine the two PX that must combine the two PY and the two PZ. If we combine all these four atomic orbitals, we will get four hybrid orbitals that are all identical and look like this. So we get four SP, three hybridized orbitals in which we have 25% S character and 75% P character. So this guy undergoes hybridization, we get the following depiction.