1. g^2 - 6g - 55 = 0
-55 = 1*(-55) = 5*(-11)
Choose the pair of factors whose sum = B
: 5, and -11.
(g+5)(g-11) = 0
g+5 = 0
g = -5.
g-11 = 0
g = 11.
Solution: g = -5, and 11.
2. k^3 + k = 0
k(k^2+1) = 0
k = 0
k^2 + 1 = 0
k^2 = -1
k = sqrt(-1) = I
Solution: k = 0, and i.
3. k^2 + k - 42 = 0
-42 = -6*7. Sum = -6 + 7 = 1 = B.
(k-6)(k+7) = 0
k-6 = 0
k = 6
k+7 = 0
k = -7.
Solution: k = -7, and 6.
Please help me solve these two Rational Expressions? Sorry my addition sign does not work on my keyboard, so that is why I am using the word "plus".
1). g^2-6g-55
__________
g
2). k^3 plus k
___________
k^2 plus k-42
1 answer