What are the roots of the quadratic equation x² - 3x - 40 = 0?
A. -10 and 4
B. 10 and -4
C. -8 and 5
D. 8 and -5
A. -10 and 4
B. 10 and -4
C. -8 and 5
D. 8 and -5
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Answer:
D 8 and -5
Step-by-step explanation:
factor
(x-8)(x+5)
then both 2 equated to 0
x-8 =0
x-8+8=0+8
x=8
x+5=0
x+5-5=0-5
x=-5