How do you solve the equation for y: #x^2+17x+72=0#?

1 Answer
Jul 8, 2015

Answer:

Solve #y = x^2 + 17x + 72 = 0#

Explanation:

#y = x^2 + 17x + 72 = 0.#
I use the new Transforming Method (Google, Yahoo Search)
Find 2 numbers knowing sum (17) and product (72). Both real roots are negative (Rule of Signs).

Factor pairs of 72 -> ...(-4, -18)(-6, -12)(-8, -9). This sum is -17 = -b.

Then, the 2 real roots are:# -8 and -9.#