# If f(x) = 2×2 − 30, find f(4).?

algebra 1 substitute x for 4

• 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

• 2x^2 - 30

2(4)^2 - 30

2*16 - 30

32 - 30 = 2

• f (4) = 2 (16) - 30

f (4) = 32 - 30

f (4) = 2

• 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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