If x is a number such that x^2 + 3x - 10 = 0 and x^2 + x - 20 = 0, then x =
If x is a number such that x^2 + 3x - 10 = 0 and x^2 + x - 20 = 0, then x =
Answer/Solution
-5
Steps/Work
x^2 + 3x - 10 = (x+5)(x-2) = 0
Then x=-5 or x=2.
x^2 + x - 20 = (x-4)(x+5) = 0
Then x=4 or x=-5.
Thus x=-5.
The answer is E.
Then x=-5 or x=2.
x^2 + x - 20 = (x-4)(x+5) = 0
Then x=4 or x=-5.
Thus x=-5.
The answer is E.