已知函数f(x)=3x2+2x,
(1)求f(2),f(-2),f(2)+f(-2)的值;
(2)求f(a),f(-a),f(a)+f(-a)的值.
人气:337 ℃ 时间:2019-08-21 05:42:08
解答
(1)∵f(x)=3x2+2x,
∴f(2)=12,f(-2)=4,f(2)+f(-2)=16,
(2)f(a)=3a2+2a,f(-a)=3a2-2a,f(-a)+f(a)=3a2+2a+3a2-2a=6a2,
f(-a)+f(a)=6a2.
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