The quadratic formula is the result of completing the square for ax^2+bx+c=0 when a,b, and c are unknown values. This result is:
x=(-b±√(b^2-4ac))/(2a), we have x^2-x-2=0 so
x=(1±√(1+8))/2
x=(1±√9)/2
x=(1±3)/2
x=-1 and 2
Answer:
Step-by-step explanation:
500×30=15000
-2a from both sides then divide by -5 and a=1
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Apply distributive property :
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5(a + 4) = 5a + 20 (Answer D)
