Question

a+b=9, ab=-5
find the value of 4ab ​

Answer 1

$since \: ab = \: - 5$

$4ab \: = \: - 5 \times 4 = \: - 20$

$the \: answer \: is \: (- 20)$

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Answer 2

4

$4( - 5) \: \: \: \: \: \: the \: value \: of : ab \: i s \: - 5 \\ puttingthevalueofab \\ - 20$