Question

If s(x) = 2 – x2 and t(x) = 3x, which value is equivalent to (s•t)(-7)
–439
–141
153
443

Answer 1

Interpret (s•t)(x) as s(t(x)). First compute t(-7) = 3(−7) = −21. Then s(−21) = 2 − (−21)^2 = 2 − 441 = −439.