How do you solve this and explanation please?
- KrishnamurthyLv 73 months ago
x^2 + 3x - 10 = 0
(x + 5)(x - 2) = 0
x = 2
- rotchmLv 73 months ago
The area is (x+3)*x which must equal 10.
You can try a few good guesses: If x = 0 do you get 10?
If x = 1...? Etc.
Or algebraically: expand (x+3)*x to get x² + 3x. Thus x² + 3x = 10. Rewrite as
x² + 3x - 10 = 0.
Now just solve this by factoring or quadratic eqs.
Hopefully no one will spoil you the answer. That would be very irresponsible of them.
- ted sLv 73 months ago
x² + 3x - 10 = (x+ 5 ) ( x - 2) = 0 when x = 2