algebra 1 substitute x for 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

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)=2x230 = 26

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