Solve the equation by factoring. (Enter your answers as a comma-separated list.) 4x2 + 11x − 45 = 0

Question

Solve the equation by factoring. (Enter your answers as a comma-separated list.)

4x² + 11x − 45 = 0

Answer 1

(4x-9)(x+5)

by FOIL

= 4x^2 -9x+20x -45

You factor by trial and error, using factors of 4 and 45

either (4x ) and (x ) or (2x ) and (2x )

45 is 5 x 9 or 15 x3

Just try out different combinations that give you -9x