F(x) = 7 - 5x + 7x2
find f(-9)
2 answers:
Answer:
Step-by-step explanation:
F(x) = 7 - 5x + 7x²
f(-9) = 7 - 5*(-9) + 7*(-9)²
= 7 + 45 + 7*81
= 7 + 45 + 567
= 619
Answer:
f(-9) = 619
Step-by-step explanation:
To solve for f(-9), plug -9 in for x in the equation of f(x). In other words, change all x's into -9 in the equation 7 - 5x + 7x² and then solve.
f(x) = 7 - 5x + 7x²
Plug in -9 for x.
f(-9) = 7 - 5(-9) + 7(-9)²
Simplify. 5(-9) = -45, 7(-9)² = 7(81) = 567
f(-9) = 7 + 45 + 567
Solve.
f(-9) = 619
The answer is 619.
I hope this helps. If you need clarifications of anything, feel free to ask. Happy studying. :)
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