The problem
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if P(x)=x^2+x+1 and Q(x)=5^2-1, find Q(-9)
Answer provided by our tutors
In the solver you have:
Q(x)=5x^2-1
You want to find 'Q(-9)' and this means that you need to plug in the value 'x = -9' into '5x^2-1':
Q(-9) = 5*(-9)^2-1
Q(-9) = 5*81 - 1
Q(-9) = 405 - 1
Q(-9) = 404