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f(-2) = a(-2) +b
= -2a + b
f(2) = a(2) +b
= 2a + b
nilai dari
f(-2)-f(2) = -2a + b -2a +b
= -4a + 2b
f(2) = a(2) + b = 2a + b
Maka;
f(-2) - f(2) = -2a + b - 2a + b = -2a - 2a + b + b = -4a + 2b