x = -5
x = 10
x + 10 = 0
bc = 750
Correct answer is B
x2+15x+50=0
x2+5x+10x+50=0
x(x+5)+10(x+5)=0
(x+5)(x+10)=0
x + 5 = 0 or x + 10 = 0.
Comparing x2+15x+50 with ax2+bx+c, b = 15 and c = 50.
∴ bc = 750.
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