If f(x) = 2×2 − 30, find f(4).?
To find the value of the function f(x) = 2x² - 30 when x is equal to 4, substitute 4 into the equation. What is the result of f(4)?
7 Answers
are you trying to write 2x² here?
f(x) = 2x² - 30, x = 4
2*(4)² - 30
2*16 - 30
32 - 30
f(4) = -2
This is not difficult, simply plug the value into the equation:
f(4) = 2(4)(2) - 30
f(4) = 16 - 30
f(4) = -14
Do what your book said. Substitute f(x) for 4
4 = 2x^2 - 30
2 = x^2 - 15
17 = x^2
x = sqrt(17)
sorry but doesn't the x in your equation multiplication .. because if it does then u can't solve it for f(4)
anyway F(x)=2x2-30 = -26
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