nancisundeed nancisundeed

19-12-2020
Mathematics

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F(x)=ax^2+bx-2
Calculate a and b such that
F (I) = 5 and F (-2)=20

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melikaz melikaz

19-12-2020

a=6 , b=1

If F(1)=5 then we have 5= a + b -2
If F(-2)=20 then 22= 4a -2b
If we simplify the second one : 11=2a -b
Then by adding these two we have 3a=18, so a=6 and b=1

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