Question

solve for x
(4-x)(5-x)=3

Answer 1

first expand
(4-x)(5-x) = 20 -4x -5x + x^2 = x^2-9x+20

so
x^2-9x+20=3
x^2 - 9x + 17 = 0

it is a quadratic now... do you know how to solve it?

Answer 2

6.302775637, 2.697224362
is this right?

Answer 3

using the calculayor... yes you are right

but dont you know the quadratic formula to find the solutions?

Answer 4

yeah -b +or- squareroot of b*2-4ac / 2a

Answer 5

or is that wrong?

Answer 6

yes thats it.. and its better to use it.. it gives the exact values