If a+b=−6, and a=10/b, what is the value of a^2+b^2? Choose the correct answer:
A) 22
B) 24
C) 16
D) 18
E) 20
a^2 + b^2 should make you think of these formulas:   (a+b)(a+b) = a^2+b^2+2ab   We already know (a+b) = -6 and a*b = 10   (a+b)(a+b) = (-6)(-6) = a^2+b^2+2*(10)   a^2+b^2 = 36 - 20= 
<gadget id="calculator">36 - 20</gadget>
<output>16</output>
16   Answer : 16
<result>C</result>
If a+b=−6, and a=10/b, what is the value of a^2+b^2?