The answer is nine because 2(4)=8 3(2)=6 7=7, os 8-6+7= 2+7 =9
50:
40 is 10 less than 50
60 is 10 more than 50
4d=56
d=14. Ad a result, Dorothy is 14 years old. Hope it help!
Answer:
(x-3)(x^2-7) = x^3 -3x^2 -7x + 21
just change the sign of the root and put x in front of it, then multiply the factors all together
(x-3)(x-sqr7)(x+sqr7) roots come in conjugate pairs to eliminate irrational coefficients
(x-sqr7)(x+sqr7) = x^2-7. similar to (a-b)(a+b) = a^2-b^2
Step-by-step explanation:
