x + (x + 3) + [tex] x^{2} [/tex] = 75
so you will add up all of the x 's but NOT the x^2
2x + 3 + [tex] x^{2} [/tex] = 75
Rearrange to put the x^2 in front of 2x
[tex] x^{2} [/tex] + 2x + 3 = 75
subtract the 75 from both sides
[tex] x^{2} [/tex] + 2x - 72 = 0
