Solve the equation by the quadratic formula.2x2 = 26
A. ±
B. 14
C. 13
D. ±13
Answer: A
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Show that the function is a solution of the wave equation.w(x, t) = cos (9ct) sin (9x)
A. Yes B. No
Evaluate the expression.3-4
A. 
B. 81
C. -81
D. 
Find all the first order partial derivatives for the following function.f(x ,y, z) = (sin xy)(cos yz2)
A. 
= (y cos xy)(cos yz2); 
= (x cos xy)(cos yz2); 
= -2(yz sin xy)(sin yz2)
B. 
= (y cos xy)(cos yz2); 
= (x cos xy)(cos yz2) - (z2 sin xy)(sin yz2); 
= 2(yz sin xy)(sin yz2)
C. 
= (y cos xy)(cos yz2); 
= (z2 sin xy)(sin yz2)- (x cos xy)(cos yz2); 
= 2(yz sin xy)(sin yz2)
D. 
= (y cos xy)(cosyz2); 
= (x cos xy)(cos yz2) - (z2 sin xy)(sin yz2); 
= -2(yz sin xy)(sin yz2)
Find the linearization L(x) of the given function for the given value of a.f(x) = 
, a = 0
A. L(x) = - 
x
B. L(x) = 
x
C. L(x) = - 
x
D. L(x) = 
x