Thread: Equation

(3x +a) (bx-3)= 6x^2 +x-15

The equation is true for all values of x, when a and b are constant. What is the value of ab?

i did the foil method and came up with 10. Is that correct? or is it -10?

+10 is correct

Originally Posted by tahirakw

(3x +a) (bx-3)= 6x^2 +x-15

The equation is true for all values of x, when a and b are constant. What is the value of ab?

i did the foil method and came up with 10. Is that correct? or is it -10?

For this to be equal to it requires that , and so as you found.