Question

If x equal to minus 2 is the root of equation 3 x square + 7 x + b equal to zero

Answer 1

Answer:

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Answer 2

Hey friend,

Here is the solution :-

$given \: that \: x = - 2 \\ \\f(x) = {3x}^{2} + 7x + b = 0 \\ \\ put \: x = - 2 \\ \\ f( - 2) = 3( - 2)^{2} + 7( - 2) + b = 0 \\ \\ 3(4) + 7( - 2) + b = 0 \\ \\ 12 - 14 + b = 0 \\ \\ - 2 + b = 0 \\ \\ b = 2$

Here we get b = 2.

✨I hope this will help you....✨