<span>x(a+b)=xa+xb</span>.
<span>4(3+7)</span>
<span><span>4∗3+4∗7</span>
Please=Parentheses
Excuse=Exponents
My=Multiply
Dear=Divide
Aunt=Add
Sally-Subtract
</span>
Answer: 1.2
Step-by-step explanation:
Answer:
k=-9±2√15
Step-by-step explanation:
For the above quadratic to have equal roots then it's discriminant b²-4ac must equal 0
By comparing x²+(k+9)x+15=0 with ax²+bx+c=0,a=1,b=k+9 and c=15
(k+9)²-4(1×15)=0
k²+18k+81-60=0
k²+18k+21=0(factorize)
k=-9±2√15
When we take the logarithm of both sides of eln(xy)=eln(x)+ln(y), we obtain ln(eln(xy))=ln(eln(x)+ln(y)). The logarithms and exponentials cancel each other out (equation (4)), giving our product rule for logarithms, ln(xy)=ln(x)+ln(y).
