Question

would you use quadratic formula, graphing, or factoring for 8x^2+117x-45=0 and how?

Answer 1

Factoring is always my first choice. That is, I look to see if the quadratic will factor over the set of Rational numbers.

8x^2+117x-45=0

(x + 15) (8x-3) = 0 ---> Factorization

Zero Product Property

x = -15 or 8x - 3 = 0
x = -15 or 8x = 3 and x = 3/8

Answer 2

this can be factorised multiply 8 and -45.... = -360... find the factors that add to 117

120 and - 3


gives the answer (x + 15)(8x - 3)

x = -15 and 3/8 are solutions to the quadratic