What are the roots of the quadratic equation x2 - 7x + 12 = 0?
A. 3 and 4
B. -3 and -4
C. -3 and 4
D. 3 and -4
A. 3 and 4
B. -3 and -4
C. -3 and 4
D. 3 and -4
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Step-by-step explanation:
Solution:
a=1,b=+7,c=+12
x=2a−b±b2−4ac
x=2×1−(+7)±72−4×1×12
x=2−7±49−48
x=2−7±1
x=2−7+1 or x=2−7−1
x=−3 or x=−4