Question

The product of a certain number plus 3 and that same number minus 5 is 9. Set up an equation and solve the equation to find the number.

Answer 1

my equation was (x+3)(x-5)=9 but i don't know if that's right

Answer 2

i got x=16

Answer 3

(x+3)(x-5) = 9
x^2-2x-15=9
x^2-2x-24=0
(x+4)(x-6)=0
x=-4,6

Answer 4

ohhhh ok

Answer 5

thanks

Answer 6

@OakTree why did u distribute at the first step?

Answer 7

That's because you can't solve for the roots until your equation is equal to zero. Basic rule of algebra!