If \(x^2 +15x + 50 = ax^2 + bx + c = 0\). Which of the following statement is not true?
- x = -5
- x = 10
- x + 10 = 0
-
bc = 750
The correct answer is: D
Explanation
\(x^2 + 15x + 50 = 0\)
\(x^2 + 5x + 10x + 50 = 0\)
\(x(x + 5) + 10(x + 5) = 0\)
\((x + 5)(x + 10) = 0\)
x + 5 = 0 or x + 10 = 0.
Comparing \(x^2 + 15x + 50\) with \(ax^2 + bx + c\), b = 15 and c = 50.
\(\therefore\) bc = 750.