How to find f(x)*g(x)

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Tran
Tran 2015-3-25
评论： John D'Errico 2021-4-6
Hi!
If i have f(x) = 1 + x and g(x) = 1 - x, i want to find h(x) = f(x)*g(x) = (1+x)*(1-x)=1-x.^2 What should i do?
Thanks!

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回答（2 个）

Star Strider
Star Strider 2015-3-25
It looks like you already did it. To code it using anonymous functions:
f = @(x) 1 + x;
g = @(x) 1 - x;
h = @(x) f(x).*g(x);
x = linspace(-10, 10);
figure(1)
plot(x, f(x), x, g(x), x, h(x))
grid
legend('f(x)', 'g(x)', 'h(x)', 'Location', 'south')
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Tran
Tran 2015-3-25
Thank you so much James Tursa!
Star Strider
Star Strider 2015-3-25
@James — Thank you!
@Tran — My pleasure!

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Tanveer ul haq
Tanveer ul haq 2021-4-6
syms x
f = 1 + x;
g = 1 - x;
h = simplify(f*g)
  1 个评论
John D'Errico
John D'Errico 2021-4-6
Note that this does not actually solve the problem as asked.

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